Use specific glyph name in HTML??

How can I use for example the glyph name "rcaron.terminal" which has no Unicode value in HTML? or any other such case? Is it even possible? I think it must be surely but I got no clue.

It's easy for regular letters like the glyph "ß" where I would just type "&#xDF" and get that character or "&#223" (same result) but for glyphs without any Unicode value I don't know what I'm supposed to do...? I've tried also &rcaron.terminal; but nothing, where as something like "&hearts" would work giving a heart glyph of god knows what font, probably Arial I dunno.

Do I need to use state some specific encoding aside from ANSI in my html document?

ie. < meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-8" > or something... like Im really lost lol