∬ Double Integral U+222C

The Unicode character « ∬ », officially named Double Integral, was introduced in Unicode version 1.1. It is part of the Math Operators block, which belongs to the Basic Multilingual plane.

Categorized technically as a Math Symbol, the U+222C character typically falls under the Common script. In terms of text layout and rendering, the glyph is a compatibility composition and has ambiguous in East Asian typography. When placed in bidirectional text, it behaves as an Other Neutral character. Its visual representation remains mirrored regardless of the reading direction.