SD

See also s.d., S.D., and .sd

Translingual

Symbol

SD

1. (US) South Dakota, a state of the United States of America.
2. The ISO 3166-1 two-letter (alpha-2) code for Sudan.

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English

Initialism

SD

1. School district
2. (law enforcement) Sheriff's department
3. (medicine) Shacklesons Disease, a rare brain disease.
4. (mathematics) Standard deviation, a mathematical measure of the spread of a list of numbers.
5. (television) standard definition, SDTV
6. Secure Digital, a non-volatile memory card format developed by Matsushita, SanDisk, and Toshiba for use in portable devices.

Derived terms

• (memory card format) microSD, miniSD, SDHC, SDIO, SDXC

Anagrams

• d's , D's, DS

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Spanish

Initialism

SD

1. (grammar, syntax) Abbreviation of sintagma determinante.