Mathematical Bold Small U 𝐮

Visual Description: The character is a bold, rounded lowercase u. It matches the size of other bold letters in mathematical fonts. It appears heavier than a regular u to emphasize a variable or component. In formulas it pairs with symbols for vectors, functions, and constants. On screens and in print, it reads clearly and stays compact.

Meaning & Usage: The bold u signals a specific kind of symbol in mathematics. It often denotes a vector component, a unit, or a distinguished variable. It helps separate this u from ordinary letters in dense equations. In calculators and editors, bold styling aids quick comparisons and visual scanning.

Historical Background: Typography evolved to support clear math notation. Bold alphanumeric symbols were designed to distinguish variables, vectors, and operators. Digital fonts and typesetting tools adopted these conventions to keep formulas readable. The approach grew as math software added style controls for emphasis, organization, and comparisons.

Practical Use: In everyday math work, the bold u marks specialized roles. Use it for vector components, units in physics, or named variables in models. In calculators and UI panels, a bold toggle or style selector can switch to this look to compare items quickly. It supports quick visual checks and error avoidance.

See our category page for related symbols.

Look‑alikes: u (U+75).

Need styled alternatives? Try the Fancy Text tool.