⊥

Math Operator 162

Unicode
U+22A5
Category
Math
HTML Entity
⊥
CSS
\22A5
The ⊥ symbol, officially known in Unicode as the "Up Tack," is most widely recognized in mathematics as the perpendicular sign, indicating that two lines intersect at a 90-degree angle. In logic and lattice theory, it serves as the "bottom" element, representing absolute falsity or the lowest value in a structured set. While primarily used in academic papers and technical documentation, it occasionally pops up in text-based emoticons to represent a nose or a tiny table.

How to Type

Windows
Alt+8869 or type 22A5 then press Alt+X
macOS
Control+Command+Space then search "perpendicular" or "up tack"
Linux
Ctrl+Shift+U then 22A5
HTML
⊥

In Programming

In LaTeX, this symbol is generated using \perp for geometry or \bot for logic to represent the boolean "false" state. It also appears in type theory to denote an undefined or bottom type.

Read full meaning article

Tags

90 degree angle LaTeX perp \perp boolean false bottom bottom element false falsity falsum formal logic geometry symbol lattice bottom logic logical false mathematics perpendicular perpendicular lines perpendicular sign right angle symbol text emoticon nose up tack

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