Sassoon Sans has a vertical f like that, but there is more contrast in your letter suggesting a serif font. It's possible the italic was backslanted. It might also be a Math function (ƒ) symbol [Option-f on a Mac]. Most font showings don't show this glyph, so it would be hard to browse for this one.

Just for fun I typed that function symbol as the sample word and then used 'Garalde' as the search term. There were a few that were vertical, or nearly so, but most had different details. I thought Dante was pretty close. You might find something even closer if you looked at more than the 225 families this search pulled up.

Thanks, Mike. I hadn't considered that it could be the function symbol; thanks for that and I'm sure I can find a suitable substitute, or at least one I can slant back to match closely enough.

Indeed, it does seem that the vertical ital f is extremely rare in serif families.

If you are willing to play with a font editor, another solution is to take an upright integral sign and add some horizontal bar. Just look at the characters 0x0072 and 0x0077 in the opticals of the font wasy (that comes with the tex installation packages). Here is what the character looks like:

So, it seems, you are not the only one to assume that, yet I am unaware of a character called "function symbol" in mathematics. In France, there is a tradition where capital letters and Greek letters used in mathematical formulae are upright (and that is why the psi in my avatar is upright) but I am unaware of a mathematical tradition that would denote functions with small upright italic letters. If I use the LaTeX fourier package with the upright option to denote a function f from X to Y, I get this

The X and Y are upright (contrary to the American tradition) but the f is not.

[Edit] However, I have seen comments on another thread where it is contended that the florin should be slanted...

Michel, I think it is usual for that symbol to be slanted, but apparently some typefaces use much less slant than others. When I was an engineering student it didn't matter, since it only needed to look like a lower case f with a tail (we were writing it all by hand in the 60's). It's not clear how the posted glyph was being used.

Mike, there are two independent questions here, the hook and the slant. Concerning the use, here is something interesting I found in Victor Gaultney's (pdf) text gentium, a typeface for the nations, and I cite:

The design of the italic f [in Gentium] allows a clear distinction to be made between it and the hooked version. Both are used for the Ewe language of Ghana.

and he gives the example:

I gather that in the regular, that should read

and that U+0192 should normally be upright in the regular and, in the italic, it should share it's slant.

As for the requirement of a hooked f in mathematical formulas, I am suprised at what you say but engineers may have conventions that mathematicians don't. Normally mathematics lowercase is italics and, in most fonts but not all, the italic f is hooked. So I looked at my math books to see if any would use a non hooked italic f to represent a function; I found a few nicely edited books from the Springer series "Ergebnisse der mathematik" (one of which is even printed in the USA) with f(x) written as in (1), which is less hooked than the non hooked gentium italic f. I found essentially the same f in two books published in France (2); I also found a little book from Mir publishers, Moscow, with an italic f(x) that is absolutely not hooked (3). Those books date from the sixties and seventies and are all "graduate level" pure mathematics.

If you have any reference about that hook requirement, please let me know.

Michel, you have done much more research on this than I have. I was an engineering student in 1962-67, when anything we did was done by hand. We didn't even have calculators, not to mention laptops. As long as what we wrote seemed to resemble the function symbol, that was good enough. Our textbooks were probably printed with metal type, and I can't honestly say that I paid too much attention in those days to what the function symbol f was like. At that point it would still be about 20 years until I started caring about fonts, or noticing details like that.

I tend to think that the 'requirements' about this are just general conventions, and as long as the function symbol is distinct from the other lettering in the textbooks, no one would be confused. I have been told that mathematicians can be very particular about their symbols, but as long as I am not typesetting one of their books, I don't think I will worry about it much.

We still don't even know what the 'f' of this post was supposed to be -- a vertical italic f, or a Florin symbol, or a function symbol -- but it seems we have answered the question well enough.

I am impressed by your thoroughness though, and I have noticed that about you before. Well done.

it seems we have answered the question well enough.

Agreed, but the comment "= function symbol" for U+0192 in the unicode chart troubled me. I now had a look at the Unicode Technical Report #25, Unicode support for mathematics, which seems to solve my worry: U+0192 is not in the mathematical character repertoire: the report refers nowhere to any character in the range U+0100..U+01FF.

Most font showings don’t show this glyph, so it would be hard to browse for this one.

Mike, with the character palette, you can see them all by selecting the view "Code Tables", "Latin Extended-B" and then clicking on character 0192 (line 0190, column 2).

## Comments

## Sassoon Sans has a vertical

Sassoon Sans has a vertical f like that, but there is more contrast in your letter suggesting a serif font. It's possible the italic was backslanted. It might also be a Math function (ƒ) symbol [Option-f on a Mac]. Most font showings don't show this glyph, so it would be hard to browse for this one.

- Mike Yanega

## Just for fun I typed that

Just for fun I typed that function symbol as the sample word and then used 'Garalde' as the search term. There were a few that were vertical, or nearly so, but most had different details. I thought Dante was pretty close. You might find something even closer if you looked at more than the 225 families this search pulled up.

- Mike Yanega

## Thanks, Mike. I hadn’t

Thanks, Mike. I hadn't considered that it could be the function symbol; thanks for that and I'm sure I can find a suitable substitute, or at least one I can slant back to match closely enough.

Indeed, it does seem that the vertical ital f is extremely rare in serif families.

Thank you again.

## This might also be florin

This might also be florin (not italic). Here is Gentium's florin

## There sure is a resemblance.

There sure is a resemblance. And it appears small enough that whatever differences there are may be negligible.

## If you are willing to play

If you are willing to play with a font editor, another solution is to take an upright integral sign and add some horizontal bar. Just look at the characters 0x0072 and 0x0077 in the opticals of the font wasy (that comes with the tex installation packages). Here is what the character looks like:

The license says "public domain".

## Mike mentioned Dante. The

Mike mentioned Dante. The florin (character 0x0192) of Dante regular is close indeed:

## Hmm, some of the references

Hmm, some of the references I found said that Option-f on the Mac is the Florin. I just assumed it was the math function symbol.

- Mike Yanega

## I just assumed it was the

I just assumed it was the math function symbol.

If we look at the unicode chart http://www.unicode.org/charts/PDF/U0180.pdf we see this

So, it seems, you are not the only one to assume that, yet I am unaware of a character called "function symbol" in mathematics. In France, there is a tradition where capital letters and Greek letters used in mathematical formulae are upright (and that is why the psi in my avatar is upright) but I am unaware of a mathematical tradition that would denote functions with small upright italic letters. If I use the LaTeX fourier package with the upright option to denote a function

ffrom X to Y, I get thisThe X and Y are upright (contrary to the American tradition) but the f is not.

[Edit] However, I have seen comments on another thread where it is contended that the florin should be slanted...

## Michel, I think it is usual

Michel, I think it is usual for that symbol to be slanted, but apparently some typefaces use much less slant than others. When I was an engineering student it didn't matter, since it only needed to look like a lower case f with a tail (we were writing it all by hand in the 60's). It's not clear how the posted glyph was being used.

- Mike Yanega

## Mike, there are two

Mike, there are two independent questions here, the hook and the slant. Concerning the use, here is something interesting I found in Victor Gaultney's (pdf) text

gentium, a typeface for the nations, and I cite:The design of the italic f [in Gentium] allows a clear distinction to be made between it and the hooked version. Both are used for the Ewe language of Ghana.and he gives the example:

I gather that in the regular, that should read

and that U+0192 should normally be upright in the regular and, in the italic, it should share it's slant.

As for the requirement of a hooked f in mathematical formulas, I am suprised at what you say but engineers may have conventions that mathematicians don't. Normally mathematics lowercase is italics and, in most fonts but not all, the italic f is hooked. So I looked at my math books to see if any would use a non hooked italic f to represent a function; I found a few nicely edited books from the Springer series "Ergebnisse der mathematik" (one of which is even printed in the USA) with f(x) written as in (1), which is less hooked than the non hooked gentium italic f. I found essentially the same f in two books published in France (2); I also found a little book from Mir publishers, Moscow, with an italic f(x) that is absolutely not hooked (3). Those books date from the sixties and seventies and are all "graduate level" pure mathematics.

If you have any reference about that hook requirement, please let me know.

Michel Boyer

## Michel, you have done much

Michel, you have done much more research on this than I have. I was an engineering student in 1962-67, when anything we did was done by hand. We didn't even have calculators, not to mention laptops. As long as what we wrote seemed to resemble the function symbol, that was good enough. Our textbooks were probably printed with metal type, and I can't honestly say that I paid too much attention in those days to what the function symbol f was like. At that point it would still be about 20 years until I started caring about fonts, or noticing details like that.

I tend to think that the 'requirements' about this are just general conventions, and as long as the function symbol is distinct from the other lettering in the textbooks, no one would be confused. I have been told that mathematicians can be very particular about their symbols, but as long as I am not typesetting one of their books, I don't think I will worry about it much.

We still don't even know what the 'f' of this post was supposed to be -- a vertical italic f, or a Florin symbol, or a function symbol -- but it seems we have answered the question well enough.

I am impressed by your thoroughness though, and I have noticed that about you before. Well done.

- Mike Yanega

## it seems we have answered

it seems we have answered the question well enough.

Agreed, but the comment "= function symbol" for U+0192 in the unicode chart troubled me. I now had a look at the Unicode Technical Report #25,

Unicode support for mathematics, which seems to solve my worry: U+0192 is not in the mathematical character repertoire: the report refers nowhere to any character in the range U+0100..U+01FF.Solved for me too.

Michel Boyer

## Most font showings don’t

Most font showings don’t show this glyph, so it would be hard to browse for this one.

Mike, with the character palette, you can see them all by selecting the view "Code Tables", "Latin Extended-B" and then clicking on character 0192 (line 0190, column 2).