U+22A4 "⊤" Down Tack Unicode Character
Unicode Version 17.0
⊤
U+22A4 "⊤" Down Tack is a mathematical symbol that denotes logical truth, the top element in a lattice or order theory, or a constant true value in formal logic, often contrasted with the up tack (⊥) which represents falsity. In type theory and computer science, it is used to represent the unit type or a terminal object in certain categorical contexts, signifying a type with exactly one value or a universally accepted proposition. Its visual appearance, resembling an inverted "T", makes it a concise marker for absolute truth or maximal elements across various branches of mathematics and theoretical computing.
General Properties
| Code Point | U+22A4 |
| Version Added | 1.1 |
| Name | Down Tack |
| Block | Mathematical Operators |
| General Category | Math Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
Encodings
| HTML Decimal Encoding | ⊤ |
| HTML Hex Encoding | ⊤ |
| UTF-8 Encoding | 0xE2 0x8A 0xA4 |
| UTF-16 Encoding | 0x22A4 |
| UTF-32 Encoding | 0x000022A4 |
| C/C++/Java Escape | \u22a4 |
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 |