≜

Math Operator 89

Unicode
U+225C
Category
Math
HTML Entity
≜
CSS
\225C
The ≜ symbol, officially known as "Delta Equal To," represents the mathematical concept of "is defined as" or "equal by definition." It combines a standard equals sign with a Greek delta (Δ) positioned above it, visually signaling that the expression on one side is explicitly defined by the value on the other. Beyond formal logic and engineering equations, it frequently appears in technical typography to introduce custom variables or shorthand notation.

How to Type

Windows
Alt+8796 (on numpad) or Win+. and search "delta equal to"
macOS
Control+Command+Space then search "delta equal"
Linux
Ctrl+Shift+U then 225C
HTML
≜ or ≜

In Programming

In mathematical typesetting systems like LaTeX, this symbol is generated using the `\triangleq` command. Programmers and data scientists frequently use it in technical documentation to clearly distinguish a new variable definition from a standard equality test.

Read full meaning article

Tags

delta equal defined as mathematics relation definition

Related Symbols

± Plus Minus Sign × Multiplication Sign ÷ Division Sign ≠ Not Equal To ≈ Approximately Equal To ∞ Infinity √ Square Root ∑ Summation ∫ Integral π Pi ≤ Less Than or Equal To ≥ Greater Than or Equal To