(logic) Initialism of selective linear definite. / (glass) Initialism of special low dispersion.

(Internet) Initialism of second-level domain. / (electronics) Initialism of semiconductor laser diode. / (physics) Initialism of superluminescent diode. / (graphics) Initialism of single-line diagram.

(UK politics) Initialism of Scottish Liberal Democrats. / (UK politics) Initialism of Social and Liberal Democrats the former name of the Liberal Democrats.

plural of SLD

Initialism of synchronous link dynamic random-access memory.

Initialism of Self-locating datum marker buoy.