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On Danish medical prescriptions you will find # and Rp. written before the description of the prescribed drugs.
# RP. is a message from the doctor to the pharmacy. # is a double cross and short for "in nomine dei", while Rp. is short for "recipe".
In other words: In God's name take... (the prescribed drugs).
Now I am just wondering: is this just a local Danish use of the crosshatch, or do you know of similiar uses elsewhere?