Attic Numerals were used by ancient Greeks, possibly from the 7th century BC. They were also known as Herodianic numerals because they were first described in a 2nd century manuscript by Herodianus. They are also known as acrophonic numerals because all of the symbols used (except for 1) derive from the first letters of the words for 'five', 'ten', 'hundred', 'thousand' and 'ten thousand'. See Greek numerals and acrophony.
