Mathematical Bold Italic Capital M 𝑴

Visual Description: The glyph is a bold italic capital M. It has thick strokes and a pronounced slant to the right. The lines are crisp on screens and in print. In typefaces used for math, it stands out beside lighter letters, balancing emphasis with readability. It often appears larger in formulas and labels.

Meaning & Usage: In formulas, a bold italic capital M is commonly used to label a matrix, a linear map, or a key variable. It helps distinguish vectors and scalars from normal text. In calculators and software, M is often shown as a selectable symbol for matrix input or a main parameter.

Historical Background: Bold italic math letters grew from typographic practices that separate emphasis, vectors, and operators. Designers and publishers created dedicated styles so symbols could be quickly read in complex equations. Unicode added a block of mathematical alphanumeric symbols to preserve these distinctions. In general, the M character acts as a versatile label in subjects, without tying itself to one meaning.

Practical Use: In teaching and quick interfaces, you can treat M as a matrix or a major variable. On calculators, a M button might switch to matrix mode, letting you enter dimensions and values with simple UI controls for operations or comparisons. For example, M & N indicates a comparison between objects, while M + N adds two matrices.

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Look‑alikes: M (U+4D).

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