(mathematics, programming, Internet slang) Initialism of for some values of.

(onomatopoeia, intransitive) To be quiet; to keep quiet. / (onomatopoeia, transitive or intransitive) To ask someone to be quiet, especially by saying shh.

(optics) A doublet lens (typically composed of a solid lens and a liquid-filled lens) made by microfabrication

simple past tense and past participle of scratch