SD

noun8

1. •
   Initialism of South Dakota: a state of the United States.
2. •
   Initialism of standard deviation.
3. •
   Initialism of school district.
4. •
   Initialism of sugar daddy
5. •
   Initialism of standard definition (“typically 640×480 pixels”).
6. •
   Initialism of sheriff's department.
7. •
   Initialism of self-destruct.
8. •
   Initialism of segmental duplication.

noun2

1. •
   (UK, historical) The pre-decimal pounds, shillings, pence.
2. •
   (UK, no longer used) Money in general.

   • He reins his horses with an air; he treats With scoffing calm whatever powers there be; He gets it straight, puts a bit on, and meets His losses with both lip and £ s. d. — 1901