s.d.

1. sine die.

2. Statistics. standard deviation.

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s.d.,

1. sight draft.

2. sine die.

3. standard deviation.

SD (no periods),

1. the security service of the Schutzstaffel in Nazi Germany (German, Sicherheitsdienst).

2. South Dakota (with postal Zip Code).

S.D.,

1. Doctor of Science (Latin, Scientiae Doctor).

2. South Dakota.

3. standard deviation.

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abbr.

■ sine die

■ Statistics standard deviation