Double-Struck Capital N ℕ

U+2115
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Symbol Meaning

The set of natural numbers ℕ = {1, 2, 3, ...} consists of numbers used in counting. Sometimes, 0 is added to this set. Sets that have the same cardinality as ℕ (countable sets) are the “smallest” of infinite sets.

Sets , , , , and are often written in bold (for example, in the works of Nicolas Bourbaki), and on blackboards and manuscripts, they are written in double letters. American mathematicians introduced double font in printed texts, and it became popular with the famous 1965 textbook on complex analysis by Gunning and Rossi.

The symbol “Double-Struck Capital N” 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

natural number.

Unicode Name Double-Struck Capital N
Unicode Number
HTML Code
CSS Code
Entity ℕ
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 2115
Simple case change 2115
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 95 226 132 149 14845077 11100010 10000100 10010101
UTF-16BE 21 15 33 21 8469 00100001 00010101
UTF-16LE 15 21 21 33 5409 00010101 00100001
UTF-32BE 00 00 21 15 0 0 33 21 8469 00000000 00000000 00100001 00010101
UTF-32LE 15 21 00 00 21 33 0 0 354484224 00010101 00100001 00000000 00000000

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