UnicodeCharactercom
∬
U+222C · DOUBLE INTEGRAL

Double Integral

  • CodepointU+222C
  • NameDOUBLE INTEGRAL
  • Decimal8748
  • BlockMathematical Operators (U+2200–U+22FF)
  • Plane0 — Basic Multilingual Plane
  • ScriptCommon
  • CategorySm — Math Symbol
  • Unicode version1.1 (1993)
  • Bidi classON — Other Neutral
  • Combining class0
  • East Asian widthA — Ambiguous
  • MirroredYes

About this character

U+222C (∬) is DOUBLE INTEGRAL, a mathematical symbol in the Mathematical Operators block. Its script is Common: it is shared by many writing systems rather than belonging to one. It was added in Unicode 1.1 (1993).

It is a compatibility variant of U+222B ∫ + U+222B ∫ (compatibility decomposition <compat>). NFC and NFD leave it alone, but NFKC and NFKD replace it with U+222B ∫ + U+222B ∫. Search engines, identifier checks and username systems that apply NFKC will treat the two as the same text.

It is a mirrored character: in right-to-left text renderers draw its mirror image.

Its East Asian Width is Ambiguous: it takes one column in Western contexts and two in East Asian legacy contexts, a common cause of misaligned tables in terminals.

How to type ∬

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Encodings & escapes

UTF-8 encoder →
UTF-8E2 88 AC3 bytes
UTF-16222C1 code unit
UTF-320000222C4 bytes
HTML named&Int;named character reference
HTML decimal&#8748;
HTML hex&#x222C;
CSS\222Cin content: "…"
JavaScript\u222C
JSON\u222C
Python\u222C
Python\N{DOUBLE INTEGRAL}by name
Java / C#\u222C
C / C++\u222Cuniversal character name
Rust / Swift / PHP\u{222C}
Go\u222C
Ruby\u222C
Excel / Sheets=UNICHAR(8748)
URL-encoded%E2%88%ACpercent-encoded UTF-8
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Normalization forms

Normalizer →
NFCunchanged
NFDunchanged
NFKCU+222B ∫ + U+222B ∫
NFKDU+222B ∫ + U+222B ∫
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Nearby in Mathematical Operators

All in block →
U+2226∦Not Parallel to U+2227∧Logical and U+2228∨Logical or U+2229∩Intersection U+222A∪Union U+222B∫Integral U+222D∭Triple Integral U+222E∮Contour Integral U+222F∯Surface Integral U+2230∰Volume Integral U+2231∱Clockwise Integral U+2232∲Clockwise Contour Integral