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.

The ſ character, as distinct from the short s (which is the s character).

Abbreviation of Song of Solomon.

signal-to-noise ratio / signal-to-noise / Initialism of serial number.

(geology, seismology) A transverse, shear wave, such as that produced by an earthquake. Movement is transverse to the direction of propagation and is a body wave.