Major League Baseball usually abbreviated "MLB", but sometimes simply "ML".

a markup language (e.g.: SGML, XML, HTML)

Mountain Leader, rank within the British Royal Marines.

Richter local magnitude (M_L), used to measure energy released in earthquakes.

Internet slang for "much love" or "make love", meaning sexual intercourse

a machine language

Malayalam language in the ISO 639-1 code.

Merrill Lynch, an investment bank

in estimation theory, maximum likelihood

Medieval Latin

megalitre (also spelled megaliter), a million litres in the metric system

some models of the Mercedes-Benz M-Class (e.g. ML320, ML430)

in artificial intelligence, the field of machine learning

Midway Airlines (ML) IATA airline designator

ML (programming language)

.ml, the top-level Internet domain for Mali.

in computer storage, MultiLevel Recording (as in ML CD-R or ML CD-RW)

in email, a mailing list

Movimiento Libertario, a libertarian political party in Costa Rica

Unified Soil Classification System symbol for silt

Motor Launch, small Royal Navy vessel used by Coastal Forces