A system of plant taxonomy published by Charles Bessey in 1915.

A particular gambling strategy used in roulette, involving working through a list of numbers that sum to a total.

plural of system operator

(biology) A system for characterizing the sex of animals, such as butterflies and Komodo dragons, in which males have two of the same kind of sex cell (ZZ) and females have two distinct sex cells (ZW).

(biology) The system that determines the sex of offspring among grasshoppers, crickets, cockroaches, and some other insects, in which females have two sex cells (XX) and males have only one sex cell (X0, or simply X; the 0 signifies the lack of another X).

plural of system tray

(computing, graphical user interface) The portion of the taskbar that displays the system time and icons for running processes, which can often launch menus for those processes.

A fire alarm system.

(biology) The system that determines the sex of humans, most other mammals, some insects (Drosophila), and some plants (Ginkgo), in which females have two of the same kind of sex cell (XX) and males have two distinct sex cells (XY).

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