∫
Integral
The elongated S of calculus: ∫ f(x) dx denotes the integral of f. In plain text, write bounds inline — ∫ from 0 to 1 — since true sub/superscript placement needs math typesetting. The glyph’s height varies by font; in some UI fonts it looks like a skinny f, so check rendering where it appears solo, e.g. as a button icon.
Copy it anywhere
- Symbol
∫ - Unicode
U+222B - HTML entity
∫ - CSS content
\222B - JavaScript
\u222B - URL encoded
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