Cube Root

A symbol from the Math Symbols collection. Click the symbol or the button below to copy.

Symbol: ∛
Unicode: U+221B
HTML entity: ∛
Category: Math Symbols

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SVG uses the system font stack — open in any vector editor and convert to outlines if needed. PNGs have a transparent background.

23 of 58 in the math symbols collection

About the cube root symbol

Representing the third root of a value, ∛ is formally known as the Cube Root symbol. It is pronounced as "the cube root of" and signifies the number that, when multiplied by itself twice, results in the original figure following the radical. This character belongs to the script of common symbols and is officially categorized within the Mathematical Operators block, where it serves as a specialized variation of the standard square root sign.

You will typically encounter this symbol in academic textbooks, scientific papers, and advanced calculators to express algebraic equations or geometric volumes. It is frequently used in math pedagogy to solve for the side length of a cube when the total volume is known. Beyond formal mathematics, the sign appears in technical documentation and programming scripts when precise radicand notation is required to distinguish from square or fourth roots.

How to type Cube Root

Native keyboard shortcuts for each operating system — derived from the codepoint, so the steps below are always accurate.

Windows

2 options

In Word / Outlook: type 221B then press Alt + X.
Anywhere: press Win + . to open the emoji & symbol picker, then search.

macOS

2 options

Enable “Unicode Hex Input” in System Settings → Keyboard, then hold Option and type 221B.
Or: Control + Command + Space opens the Character Viewer — search by name.