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
San (letter) an acute accent) or by ⟨σ̱⟩ (sigma with a macron underneath). Note, however, that the same symbol is used to denote the unrelated letter waw () in Pamphylia (the "Pamphylian digamma") and was also the form of beta () used in Melos. The Ionian letter , which later gave rise to the numeral symbol Sampi (ϡ = 900) may also be a continuation of San, although it did not have the same alphabetic position. In the Greek script used for writing the Bactrian language, there existed a letter resembling a ""þ"", which apparently stood for the sound (transliterated as "š")