Tacks vs Points - What's the difference?
tacks | points |
(rail transport, British) Movable rails which can be used to switch a train from one railway track to another.
(automotive) The two metal surfaces in a distributor which close or open to allow current to flow or not through the ignition coil. Each surface is called a point singular (there's usually a moving point which is pushed by the distributor cam and a fixed point which isn't), but they're made together in a unit and serviced or replaced that way and are hence normally called points plural.
(point)