U+27DE "⟞" Long Left Tack Unicode Character
Unicode Version 17.0
⟞
U+27DE "⟞" Long Left Tack is a mathematical symbol used primarily in the field of logic and theoretical computer science to represent a specific type of relation or operator, often appearing in sequent calculus or as a variant of the turnstile notation. Unlike the standard turnstile, the "tack" shape with an extended horizontal line emphasizes a distinct semantic role, such as indicating a longer scope or separation in formal derivations. This character belongs to the "Miscellaneous Mathematical Symbols-A" block and is designed for use in typesetting complex logical expressions where precise visual distinction is required.
General Properties
| Code Point | U+27DE |
| Version Added | 3.2 |
| Name | Long Left Tack |
| Block | Miscellaneous Mathematical Symbols-A |
| General Category | Math Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
| Mirrored | Yes |
| Mirrored Character | "⟝" U+27DD Long Right Tack |
Encodings
| HTML Decimal Encoding | ⟞ |
| HTML Hex Encoding | ⟞ |
| UTF-8 Encoding | 0xE2 0x9F 0x9E |
| UTF-16 Encoding | 0x27DE |
| UTF-32 Encoding | 0x000027DE |
| C/C++/Java Escape | \u27de |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| NFKC Quick Check | Yes |
| NFKD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| Pattern Syntax | Yes |
| Math | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Other |
| Sentence Break | Other |