An early automated flour roller mill system.

The Copernican system of astronomy, erroneously attributed to Pythagoras.

(zoology) The system of connected water channels that is unique to sponges (Porifera). / (zoology, dated) The hydrostatic skeleton of certain marine gastropods.

A manner of responding to challenges with quick thinking and improvisation.

(aviation, travel) Airline baggage allowance that restricts passengers to a specific number of bags, rather than a specific weight.

A convention whereby Esperanto’s circumflex accents (ĉ, ĝ, ĥ, ĵ, ŝ) are replaced by an h after the letter (ch, gh, hh, jh, sh) and the breve (ŭ) is left out entirely (u), for convenience of typing.

A fire alarm system.

A convention whereby Esperanto’s circumflex accents (ĉ, ĝ, ĥ, ĵ, ŝ, ŭ) are replaced by an x after the non-diacriticked letter (cx, gx, hx, jx, sx, ux), for convenience of typing.

a non-eliminating tournament format.

plural of system operator