Double-Struck Capital Z ℤ
Symbol Meaning
The set of integers ℤ = {…, -2, -1, 0, 1, 2, ...} consists of the natural numbers (positive integers), their negative counterparts, and zero. The term “integer” comes from the German word “Zahl,” meaning “number.” The set ℤ is countable (equivalent in cardinality to the set of natural numbers ℕ).
The sets ℕ , ℤ , ℚ , ℝ , ℂ are often written in bold font (for example, in the works of Nicolas Bourbaki) or as double-struck letters on blackboards and manuscripts. American mathematicians introduced the usage of double-struck font in printed texts, and it became popularized with the famous textbook on complex analysis by Gunning and Rossi, published in 1965.
The symbol “Double-Struck Capital Z” is included in the “Letterlike symbols” subblock of the “Letterlike Symbols” block and was approved as part of Unicode version 1.1 in 1993.
Synonyms
the set of integers.
| Unicode Name | Double-Struck Capital Z |
| Unicode Number | |
| HTML Code | |
| CSS Code | |
| Entity | ℤ |
| Plane | 0: Basic Multilingual Plane |
| Unicode Block | Letterlike Symbols |
| Unicode Subblock | Letterlike symbols |
| Unicode Version | 1.1 (1993) |
| Type of paired mirror bracket (bidi) | None |
| Composition Exclusion | No |
| Case change | 2124 |
| Simple case change | 2124 |
| Math | + |
| Alphabetic | + |
| Uppercase | + |
| Cased | + |
| ID_Start | + |
| ID_Continue | + |
| XID_Start | + |
| XID_Continue | + |
| Grapheme_Base | + |
| scripts | Common |
| Other_Math | + |
| Encoding | hex | dec (bytes) | dec | binary |
|---|---|---|---|---|
| UTF-8 | E2 84 A4 | 226 132 164 | 14845092 | 11100010 10000100 10100100 |
| UTF-16BE | 21 24 | 33 36 | 8484 | 00100001 00100100 |
| UTF-16LE | 24 21 | 36 33 | 9249 | 00100100 00100001 |
| UTF-32BE | 00 00 21 24 | 0 0 33 36 | 8484 | 00000000 00000000 00100001 00100100 |
| UTF-32LE | 24 21 00 00 | 36 33 0 0 | 606142464 | 00100100 00100001 00000000 00000000 |