To make a preliminary selection from a set of entities, selection criteria being based on a given set of rules or conditions.

Metal partition or shield which isolates a device from external magnetic or electric fields.

1. The surface on which a television, radar, x- ray, or cathode-ray oscilloscope image is made visible for viewing; it may be a fluorescent screen with a phosphor layer that converts the energy of an electron beam to visible light, or a translucent or opaque screen on which the optical image is projected. Also known as viewing screen.

2. See <<screen grid>>

1. A large sieve of suitably mounted wire cloth, grate bars, or perforated sheet iron used to sort rock, ore, or aggregate according to size.

2. A covering to give physical protection from light, noise, heat, or flying particles.

3. A filter medium for liquid-solid separation.