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A stroke turning a letter into a number.
Also known as: Greek numeral sign, Numeral horn
The Greek mark showing that the letters it accompanies are to be read as a numeral.
Marks the accompanying letters as a numeral rather than as a word.
Contexts: Mathematics, History
Necessary because Greek numerals are ordinary letters: without the mark, a number and a word are written identically and only context distinguishes them.
Contexts: Mathematics, History
The upper stroke marks units to hundreds and the lower one multiplies by a thousand, so the mark's position rather than its shape carries the magnitude.
Contexts: Mathematics, History
A small stroke set after and above the letters for a number, with a second stroke below and before the letters for thousands.