SDIO may refer to:
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Secure Digital Input Output
Secure Digital (SD) is a proprietary, non-volatile, flash memory card format developed by the SD Association (SDA). Owing to their compact size, SD cards have been widely adopted in a variety of portable consumer electronics, including digita ...
, a type of Secure Digital card interface. It can be used as an interface for input or output devices.
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Strategic Defense Initiative Organization
The Strategic Defense Initiative (SDI) was a proposed missile defense system intended to protect the United States from attack by ballistic nuclear missiles. The program was announced in 1983, by President Ronald Reagan. Reagan called for a ...
, an organization set up to oversee the Strategic Defense Initiative; now known as the Missile Defense Agency.
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