Romanization of Greek Greek numerals which employed the entire alphabet, including the nonstandard letters digamma, stigma, or sigma-tau (placed between epsilon and zeta), koppa (placed between pi and rho), and sampi (placed after omega). As revised in 2001, ELOT 743 provides for the uncommon characters to be given (in Greek) as $ for stigma, + for koppa, and / for sampi. These symbols are not given lower-case equivalents. When used as numbers, the letters are used in combination with the upper "keraia" numeral sign ⟨ʹ⟩ to denote numbers from 1 to 900 and in combination with the lower "keraia" ⟨͵⟩ to denote multiples
Greek Braille ά, Ά, αί. It's not used for diaeresis; ϊ is just . Digits are the same as in English Braille. Arithmetical symbols are: International letter assignments differ somewhat from those above. In Modern Greek Braille, for example, the letter omega (ω) is written the same as Latin "j", whereas in English or French braille texts it is written as a "w", which it resembles in print. Similarly, Modern Greek upsilon is written as Latin "y", but in international Greek it's written as "u", and the letter eta is inverted. This alphabet is used, for example, in mathematical notation in an