Initialism of environmental health and safety.

Initialism of olefin and surfactant.

Abbreviation of sadomasochism.

He or she; singular of they, used as a gender-neutral form of the third person singular.

he or she

(physics, astronomy) the relatively slow nucleosynthesis process, in giant stars, in which neutron capture synthesises elements up to atomic mass number 210 (at which point alpha decay becomes a deterrent to further building).

Synonym of long s

Synonym of long s

Synonym of short s

The s character, as distinct from the long s — the ſ character.