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ISO/IEC 5218
Code for representation of human sex (male or female)
ISO/IEC 5218 Information technology — Codes for the representation of human sexes is an international standard that defines a representation of human sexes through a language-neutral single-digit code. It can be used in information systems such as database applications.
The four codes specified in ISO/IEC 5218 are:
- 0 = Not known;
- 1 = Male;
- 2 = Female;
- 9 = Not applicable.