A voting system.

(management) A computer software system for organizing and facilitating collaborative creation of documents and other content, especially for loading to a website

(physiology) The circulatory system.

L-system

(education, historical) The system of home study established in connection with the summer schools assembled at Chautauqua, New York, by the Methodist Episcopal bishop John Heyl Vincent.

(historical) A haulage system for canal boats, in which an electric locomotive running on a monorail has its adhesion materially increased by the pull of the tow rope on a series of inclined gripping wheels.

(historical) A system used by the US Navy in the late 19th century to enable ship-to-ship communications at night. Each installation used a series of eight double lamps (four red and four white) hung from a mast and used to transmit visual codes.

(historical) A system of prison discipline involving periods of confinement to one's cell, associated imprisonment under the mark system, restraint intermediate between imprisonment and freedom, and liberation on ticket of leave.

(historical) A system for identifying people by a physical description based upon anthropometric measurements, notes of markings, deformities, skin colour, impression of thumb lines, etc.

(baseball) A method of sharing playing time, whereby two players are selected to play a single defensive position.