U+2124 • symbol
Double-Struck Capital Z (Z) is a symbol used in mathematics to denote the set of all integers. It is a stylized Latin capital letter Z commonly used in number theory and algebra.
The Symbol For Double-Struck Capital Z (ℤ) is a unicode character in the Basic Multilingual Plane Plane. It is found in the Letterlike Symbols block and was approved as part of Unicode Version 1.1 in 1993
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