APL explained

APL is an abbreviation, acronym, or initialism that may refer to:

Science and technology

.apl, the file extension of the Monkey's Audio metadata file
AMD Performance Library, renamed Framewave, a computer compiler library
APL (programming language), an array-based programming language
- APL (codepage), the character set for programming in APL
Address Prefix List, a DNS record type
Address (programming language), an early high-level programming language developed in the Soviet Union
Advanced Physical Layer, an extension of Ethernet 10BASE-T1L for field devices
Alexa Presentation Language, a language for developing Amazon Alexa skills
Associative Programming Language, a database query language

Adaptive Public License, an Open Source license from the University of Victoria, Canada
AROS Public License, a license of AROS Research Operating System
Arphic Public License, a free font license

APL (shipping company), a Singapore-based container and shipping company
Aden Protectorate Levies, a militia force for local defense of the Aden Protectorate
Advanced Production and Loading, a Norwegian marine engineering company formed in 1993
Afghanistan Premier League, an Afghan Twenty20 cricket league
Afghan Premier League, a men's football league in Afghanistan
American Patriot League, a proposed American football spring league
American Premiere League, a Twenty20 cricket league in the US
American President Lines, a container transportation and shipping company
American Protective League, a World War I-era pro-war organization
Applied Physics Laboratory, at Johns Hopkins University
Applied Physics Laboratory at the University of Washington
Association of Pension Lawyers, UK
Aurora Public Library (disambiguation)
Australian Professional Leagues, an Australian soccer governing body
Irish Anti-Partition League, a Northern Ireland political organisation

apl.de.ap (born 1974), pseudonym of Allan Pineda Lindo, Filipino–American musician
A US Navy hull classification symbol: Barracks craft (APL)