M̃M̃ M̃ M̃ (majuscule: M̃, minuscule: m̃) is a Latin M with a diacritical tilde. Linguistic use. "M̃–m̃" is or was used as a grapheme in several languages: In Italian, the abbreviation "Ssm̃o" or "SSm̃o" may be used for "Santissimo", "most holy" (similarly Latin "Ssm̃us" for "Sanctissimus"). Symbolic use. M̃ and m̃ are used in mathematics and physics, see "Tilde#Mathematics" and "Tilde#Physics" Computer use. On the Apple ABC extended keyboard, m̃ is made by typing m and then option-shift n. M̃ M̃ (majuscule: M̃, minuscule: m̃) is a Latin M with a diacritical tilde. Linguistic use. "M̃–m̃" is or was