Patriotska Liga (Patriotic League), Bosnian para-military organization

.pl, common filename suffix for Perl scripts

Policty Letter In the Church of Scientology (PL or P/L)

Propositional logic, a system of evaluating truth-based propositions in terms of binary logic.

.pl, common filename suffix for Prolog programs

Public liability

Private Line in shared radio frequencies

.pl, common filename suffix for TeX font property lists

packet loss

photoluminescence

PhotoLine, a software for editing digital images

Piecewise linear

pL, picolitre, a unit of volume (10⁻¹² litre)

PL, ISO 3166 code for Poland

pl, ISO 639-1 code for Polish language

PL, IATA airline designator for Airstars Airways and formerly for AeroPeru.

.pl, country code top-level domain for Poland

Ice Pellets (METAR Code)

Pioneer League, a Rookie league in Minor League Baseball

Premier League, league competition for football clubs located at the top of the English football league system

Plastic Limit in geotechnical engineering

Procedural programming, PL/C, PL/I, PL/SQL Procedural Language in computing