MALS

MALS
medium intensity approach light system.
MALSR
medium intensity approach light system with runway alignment indicator lights ...

(MALS) Medium intensity approach light system of 1400' likewise.
(SALS) Simplified approach light system 1200'+ light-bar likewise.
(SSALR/MASR) Simplified short approach light system, sequenced flashing lights and medium approach light system ...

See also: Marker beacon, Heavy, Weight, Weather, Altitude