Mathematical Sans-Serif Capital I 𝖨

Visual Description: The symbol is a tall, straight I with uniform stroke width and no serifs. It sits in a mathematical font, appearing clean and neutral. Its geometry favors vertical balance, giving it a calm, mechanical look that reads clearly in formulas and tables.

Meaning & Usage: In math notation, this I marks an index, a variable, or the identity element. It stays visually separate from text and italic letters, helping readers distinguish math symbols. In calculators and quick UI controls, the glyph flags identity rows or labels steps in a calculation.

Historical Background: These variants are part of a broader effort to standardize mathematical typography in the digital era. They come from encoding schemes that separate style from letterform, allowing formulas to express meaning without ambiguity. The goal is to support readable math across software, fonts, and international keyboards.

Practical Use: In practice, users employ this I to denote a matrix identity or a plain variable in equations. Software and calculators provide it as a one-tap option in math palettes, ensuring consistency with other sans-serif symbols. Use it to keep formulas tidy and make comparisons quick in lists and proofs.

See our category page for related symbols.

Look‑alikes: l (U+6C).

Need styled alternatives? Try the Fancy Text tool.