What ⌊ means
It returns the greatest integer no greater than the value.
⌊x⌋ encloses x: ⌊2.9⌋ is 2; ⌊−2.3⌋ is −3. It does not round toward zero.
Gauss used square brackets in 1808. In 1962, Kenneth Iverson introduced the “floor” name and paired corners for APL, a programming language.
Mathematical notation for formulas.
Don't confuse it with
1Questions people ask
1Why does ⌊ look different in my editor?
As of 2026, font fallback may draw its corner differently; the underlying character stays the same.
How to type ⌊
Windows (Word)
Alt+XType 230A, then Alt+X to get ⌊.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “left floor”.
Linux
Ctrl+Shift+UType 230a, then Enter or Space.
HTML
⌊CSS
\230Ahow to type left floor
In Julia's Unicode input (documented in 2026), type `\lfloor` and press Tab.
Codes and encoding1 code points
HTML decimal
⌊
HTML hex
⌊
CSS content
content: "\230A";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%8C%8A
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.