ISO 5218
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International standard ISO 5218 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 5218 are:
- 0 = not known,
- 1 = male,
- 2 = female,
- 9 = not specified.
The standard specifies that its use may be referred to by the designator "SEX".
The standard explicitely states that no significance is to be placed on the fact that male is encoded as 1 and female as 2. The encoding merely reflects existing practice in the countries that initiated this standard.
ISO 5218 was created by ISO's Data Management and Interchange Technical Committee and proposed in November 1976.
This standard is used, for example, in the first digit of the French social-security number (INSEE number).