SD 《略》 Diploma in Statistics; L. Scientiae Doctor (＝Doctor of Science); 【海上保険】 sea damaged; Senior Deacon; service dress; sight draft; South Dakota; special delivery; special duty; stage direction; standard deviation; standard displacement; State Department; 【軍事】 submarine detector; supply department; supply depot; 【自動車国籍表示】 Swaziland.

S/D 《略》 sight draft.

s.d. 《略》 safe deposit; same date; semi-detached; semi-diameter; semi-double; several dates; L. sine die (＝without date).

SDA 《略》 Scottish Development Agency; severe disablement allowance; Seventh Day Adventist; Sex Discrimination Act; specific dynamic action; Students for Democratic Action.