Where does “дигамма” come from?

дигамма (Russian) comes from Ancient Greek δίγαμμα, from Ancient Greek δί-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

дигамма (Russian): digamma the archaic Ancient Greek letter Ϝ/ϝ

Definitions

digamma the archaic Ancient Greek letter Ϝ/ϝ

Ancestry of “дигамма”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	δίγαμμα	the letter Ϝ
2	Ancient Greek	δί-	Twice, double
3	Ancient Greek	διά	throughout
4	Proto-Indo-European	dwís	twice, doubly; in two
5	Proto-Indo-European	dwóh₁	two

Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Indo-European dwís →Every word from Ancient Greek διά →