STD
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STD is an abbreviation used in several different contexts that stand for different terms.
- Sexually transmitted disease
- Subscriber trunk dialling
- Subscriber toll dialling
- State transition diagram
- Internet standard (a subset of the RFCs)
- ISO 4217 currency code for the São Tomé and Principe Dobra
- Doctor of Sacred Theology (see doctorate)
- std.com is an internet service provider based in Boston, Massachusetts.