∫Integral symbol
∫ is the Integral character. It is text, not a picture — it takes the colour of the type around it and pastes into anything.
- Unicode
- U+222B
- Alt code
- Alt+8747
- HTML
- ∫
- Unicode name
- Integral
Where the Integral symbol comes from
The integral sign is a long letter s, for the Latin summa. Leibniz wrote it that way in a manuscript of 1675 and it never changed — the elongated form was chosen so the symbol could stretch around whatever expression followed it.
Calculus, physics and engineering. Outside them it appears in typography demonstrations, because the character stresses a font’s handling of tall stretched glyphs more than almost anything else.
Integral symbol codes
Four notations, one result: whatever you copy here comes out as U+222B.
How to type ∫ on any keyboard
Keyboard, code, markup or document — the route to U+222B differs by tool.
Will ∫ actually show up?
We checked 147 fonts installed on a normal machine and counted how many of them contain this character. A symbol missing from a font is drawn as an empty box — the text is still correct, it just cannot be drawn.
Safe in most places. Common fonts have it. Older or decorative fonts sometimes do not, so a fallback font will kick in.
Symbols people confuse with ∫
Close enough to be mistaken for it, and still a different code point every time.
Other mathematical symbols
Relatives of this character. Each has its own page with origin, typing and font coverage.
Math symbols
Operators, set theory, logic, calculus — everything past the number row.