u21D6

U+21D6, commonly written as u21D6, is a Unicode code point in the Arrows block of the Unicode standard. It represents a single character whose visual rendering is dependent on the font and rendering system being used. Like other symbols in the Arrows block (U+2190 to U+21FF), it is used in mathematical notation, logic, and related technical contexts to convey directional or relational meaning.

Encoding and rendering: The code point can be encoded as U+21D6. In HTML, it can be included with the numeric character references ⇖ or ⇖ (decimal). The actual glyph shown depends on the font and environment; some fonts render it as a left-pointing double-arrow variant, while others may display an alternative appearance.

Usage notes: As with other specialized arrows, U+21D6 is typically employed in contexts where a directional or relational symbol is required beyond the basic arrow set. It is not commonly used in everyday prose, but it appears in technical documents, datasets, mathematical texts, and software that rely on precise symbol encoding and rendering.

Relation to other arrows: The Arrows block includes a range of related symbols, such as U+21D0 LEFTWARDS DOUBLE ARROW, U+21D1 UPWARDS DOUBLE ARROW, U+21D2 RIGHTWARDS DOUBLE ARROW, U+21D3 DOWNWARDS DOUBLE ARROW, and U+21D4 LEFT RIGHT DOUBLE ARROW. These neighboring code points help situate U+21D6 within the broader family of directional symbols.

See also: U+21D0, U+21D1, U+21D2, U+21D3, U+21D4.