PDA

PDA may refer to:

== Science and technology == Parts departing aircraft, mid-air loss of screws, rivets, doors, etc. Patron-driven acquisition, a mechanism for libraries to purchase books Personal digital assistant, an early kind of mobile device Photodiode array, a type of detector Pitch detection algorithm, to find the pitch of a signal Polydiacetylenes, a family of conducting polymers Predictive analytics, a form of business analytics Pushdown automaton, in automata theory