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Integral Symbol (∫)

The integral sign (∫) is a stretched S for 'summa' (sum), Leibniz's 1675 gift to calculus: it totals infinitely many infinitely small pieces, the area under curves.

∫

Integral · U+222B · Math Symbols

Click the symbol or the button to copy it, then paste it anywhere — documents, messages, bios and code.

Integral Symbol codes

Code	Value
Unicode code point	`U+222B`
Unicode name	`Integral`
HTML named entity	`∫`
HTML decimal	`∫`
HTML hex	`∫`
CSS content code	`\222B`
JavaScript / JSON	`\u222B`
Windows Alt code	No standard Alt code — copy it from the card above
LaTeX	`\int`

Integral Symbol variants (5)

5 related glyphs — click any tile to copy it. Tiles with a page open that symbol's own page.

∬Double Integral∭Triple Integral∮Contour Integral∯Surface Integral∰Volume Integral

Meaning & usage

The integral sign (∫) is a stretched S for 'summa' (sum), Leibniz's 1675 gift to calculus: it totals infinitely many infinitely small pieces, the area under curves. Double and triple versions (∬ ∭) integrate over surfaces and volumes.

Examples in use

Copy ∫ into a post, document or message

How to type the integral symbol

Windows

There is no Alt code or direct key for ∫. In Microsoft Word, type 222B and press Alt+X to convert it. Everywhere else, click the Copy button at the top of this page and paste it (Ctrl+V) — that always works.

Mac

There is no Option-key shortcut for ∫ on a Mac. Open the Character Viewer with Control+Command+Space, search for "Integral Symbol", and double-click to insert — or copy it from this page.

iPhone & Android

Most phone keyboards have no built-in key for ∫. Open this page on your phone, tap Copy, then paste it into your message or bio. (On Android, Gboard's emoji search finds some symbols by name.)

Linux

Press Ctrl+Shift+U, type 222b and press Enter (works in most GTK apps and terminals with IBus). Or copy it from this page.

Frequently asked questions

How do I copy the ∫ symbol?

Click the big ∫ in the card at the top of this page — it copies as a standard Unicode character (U+222B) and pastes anywhere.

How do I type ∫ on a keyboard?

There is no standard keyboard shortcut or Alt code for ∫. Copy it from this page, or in Microsoft Word type 222B and press Alt+X.

Why does ∫ sometimes show as a box or question mark?

The box (called tofu) means the device or font viewing it has no drawing for U+222B (Integral). The character itself is fine — try a different font or a newer device, or use one of the variants on this page.

Is the Integral Symbol free to use?

Yes. ∫ is a standard Unicode text character published in the Unicode Character Database. You may use it in personal and commercial documents, designs and products without permission or payment.

Related symbols

ΣSigma Symbol √Square Root Symbol