A genus (Abies) of coniferous trees, often of large size and elegant shape, some of them valued for their timber and others for their resin. The species are distinguished as the balsam fir, the silver fir, the red fir, etc. The Scotch fir is a Pinus.

Any of a number of species of wood, normally Douglas Fir, known for their light weight, high strength and straight, even grain. See vertical grain.

A light coloured and soft wood. Needs to be dried very well before use.

nonresinous wood of a fir tree

Fast instantaneous reserve. SR that increases output within the first few seconds of a contingent event involving a frequency drop.

Fast IrDA. An IrDA standard for short-range, point-to-point, and half-duplex communication using infrared that provides maximum data rate of 4 Mbps. Also see IrDA and infrared.

Far infrared

Fast Initial Response

Finite Impulse Response, a discrete, fixed duration resonse to an impulse

Finite Impulse Response (digital filter)

Finite Impulse Response filter, one containing no feedback elements