plural of Steiner system

(mathematics) In combinatorial mathematics, a type of block design, specifically a t-design with λ = 1 and t = 2 or (recently) t ≥ 2.

(software) Software for controlling the allocation and use of various hardware resources (memory, CPU time, disk space, input and output devices) to tasks and remote terminals.

A system of measurement in use in the United Kingdom and other Commonwealth countries, now mostly superseded by the metric system; similar to the system currently used in the United States; consisting of units such as the inch, the mile and the pound (of weight).

(astronomy) A group of stars (and possibly smaller bodies such as planets or asteroids) that orbit one another.

Any device with inner workings obscured.

plural of sealed system

The system of units developed in France in the 1790s and now used worldwide.

plural of operating system

(biology) The systematic study of the complex interactions in biological systems / (by extension) The study of the self-organizing behaviour of complex, dynamic non-biological systems