Double-Struck Capital Z ℤ

U+2124
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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 , , , , 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.

Text is also available in the following languages: Español; Русский;

Synonyms

the set of integers.

Unicode Name Double-Struck Capital Z
Unicode Number
HTML Code
CSS Code
Entity ℤ
Unicode Block Letterlike Symbols
Unicode Subblock Letterlike symbols
Unicode Version 1.1 (1993)
Version 1.1
Block Letterlike Symbols
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 +
age 1.1
scripts Common
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

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