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Digamma
160px  
Greek alphabet  

Αα  Alpha  Νν  Nu 
Ββ  Beta  Ξξ  Xi 
Γγ  Gamma  Οο  Omicron 
Δδ  Delta  Ππ  Pi 
Εε  Epsilon  Ρρ  Rho 
Ζζ  Zeta  Σσς  Sigma 
Ηη  Eta  Ττ  Tau 
Θθ  Theta  Υυ  Upsilon 
Ιι  Iota  Φφ  Phi 
Κκ  Kappa  Χχ  Chi 
Λλ  Lambda  Ψψ  Psi 
Μμ  Mu  Ωω  Omega 
Other letters  
Ϝϝ  Digamma  Ⱶⱶ  Heta 
Ϻϻ  San  Ϙϙ  Koppa 
Ϡϡ  Sampi  Ϛϛ  Stigma 
Ϸϸ  Sho  

Digamma or Wau (uppercase/lowercase Ϝ ϝ ς) was an old letter of the Greek alphabet. It was used before the alphabet converted its classical standard form. It looked like a Latin "F", but it was pronounced like "w". In the 5th century BC, people stopped using it because they could no longer pronounce the sound "w" in Greek. However, they kept it as a sign for the number "6" in the system of Greek numerals. It was originally called "Wau" because of its sound. Later, when the sound was lost, it was called "Digamma", which means "double Gamma", because it looks like a Gamma (Γ) with two hooks. The Latin letter F was also taken over from Wau.
In mathematics, the name "digamma" is used in digamma function, which is the derivative of the logarithm of gamma function (that is, [math](\ln \Gamma (z) )'[/math]).^{[1]}^{[2]}^{[3]}
Related pages
References
 ↑ "Greek/Hebrew/Latinbased Symbols in Mathematics" (in enUS). 20200320. https://mathvault.ca/hub/highermath/mathsymbols/greekhebrewlatinsymbols/.
 ↑ Weisstein, Eric W.. "Digamma Function" (in en). https://mathworld.wolfram.com/DigammaFunction.html.
 ↑ "Digamma Function  Brilliant Math & Science Wiki" (in enus). https://brilliant.org/wiki/digammafunction/.
Other websites
 Perseus Project: lexicon search for words starting with or containing digamma