Filter

The term filter may refer to:

Filter (chemistry) — a device to separate mixtures
Electrostatic Dust Filter
Filter (mathematics) — a certain kind of subset of a partially ordered set
Filter program — in Unix, any program with standard I/O streams.
Any software that processes a data stream (e.g. mail filter, printer filter, Internet filter)
Filter (signal processing) — a device or algorithm for signal processing (e.g. audio filter)
Filter (optics) and filter (photography) (e.g. infrared filter, ND filter, UV filter) — a device that blocks certain wavelength ranges of light
Filter (band) — a 1990s industrial rock band
Filter (water) — a device to physically separate impurities from water
Filter (part) — a device that provides a physical barrier to unwanted impuries (e.g. oil filter, lint filter)
Pneumatic filter — a device to filter air

See also