Abbreviation of three-dimensional.

(informal, chiefly US) A headwaiter.

Initialism of research, development and demonstration.

(modal, auxiliary verb) Contraction of had better.

(slang) McDonald's, a chain of fast-food restaurants.

Abbreviation of two-dimensional.

(insurance) Abbreviation of directors and officers.

(neologism, slang, Canada, US) An idiot or jerk; a general-purpose moderate insult.

(banking, business) Abbreviation of documents against payment, a trade agreement whereby shipping papers are released once the buyer has paid for the draft

Initialism of barrels per day.