Older currency symbols have evolved slowly, often from previous currencies. The modern
dollar and peso symbols originated from the mark employed to denote the
Spanish dollar, whereas the
pound and lira symbols evolved from the letter
L (written until the seventeenth century in
blackletter type as \mathfrak{L}) standing for , a
Roman pound of silver. Newly invented currencies and currencies adopting new symbols have symbolism meaningful to their adopter. For example, the euro sign is based on , an archaic form of the Greek
epsilon, to represent Europe; the
Indian rupee sign is a blend of the
Latin letter '
R' with the
Devanagari letter (
ra); and the Russian
Ruble sign is based on (the
Cyrillic capital letter
'er'). There are other considerations, such as how the symbol is rendered on computers and typesetting. For a new symbol to be used, its
glyphs needs to be added to
computer fonts and
keyboard mappings already in widespread use, and
keyboard layouts need to be altered or shortcuts added to type the new symbol. For example, the
European Commission was criticized for not considering how the
euro sign would need to be customized to work in different fonts. The original design was also exceptionally wide. These two factors have led to most
type foundries designing customized versions that match the 'look and feel' of the font to which it is to be added, often with reduced width. ==List of currency symbols currently in use==