noun

• (space science, transport) Initialism of Space Launch System. [(transport, space science) A Shuttle-derived heavy launch vehicle being designed by NASA to replace the Space Shuttle.]
• (space science, transport) Initialism of Space Launcher System. [(transport, space science, historical) A 1960s-era design program of the United States Air Force.]
• (computing) Initialism of second-level support.
• Initialism of sodium lauryl sulphate.