do in Wingdings is ♎︎□︎

A syllable attached to the first tone of the major diatonicscale for the purpose of solmization, or solfeggio. It is the firstof the seven syllables used by the Italians as manes of musicaltones, and replaced, for the sake of euphony, the syllable Ut,applied to the note C. In England and America the same syllables areused by mane as a scale pattern, while the tones in respect toabsolute pitch are named from the first seven letters of thealphabet.