Mathematical Bold Capital Digamma

It is the bold mathematical form of the old Greek letter digamma. In a formula, the author’s notation supplies its role; it is not an operator with a fixed meaning.

Greek borrowed its predecessor from Phoenician, an older neighboring writing tradition. Its waw letter marked the consonant at the start of English “win”; Greeks first called digamma wau. The exact route from Phoenician shapes to regional Greek forms is debated. A written example appears on a clay ball from Eretria dated to the late 8th century BCE. As dialects lost /w/, digamma left ordinary spelling but remained the Greek numeral six; a later curved form is ϛ, called stigma. An ancient Italic descendant shifted to /f/ and passed into Latin as F.

As of 2026, Microsoft documents this Word for Windows method: enter 1D7CA and press Alt+X.

Why is 𝟊 encoded separately?

Mathematical bold can distinguish a variable in plain text. Unicode treats mathematical alphabets as styled characters; the style can carry meaning, but the equation still decides what 𝟊 denotes.

A Unicode normalization step called NFKC or NFKD can fold 𝟊 to its plain Greek capital counterpart Ϝ, erasing the encoded bold distinction. Avoid that step when mathematical style carries meaning.