SYNCHRONIZER
synchroscope, synchronoscope, synchronizer, synchroniser
(noun) an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines)
Source: WordNet® 3.1
Etymology
Noun
synchronizer (plural synchronizers)
One who or that which synchronizes.
(automotive) Part of a synchromesh manual transmission that allows the smooth engagement of gears.
(aerial warfare) A device that permits an automatic weapon to fire between the blades of a revolving propeller.
(electronics) A kind of arbiter.
(film editing) A device for aligning multiple film strips in a replay or editing device.
(comptheory) An algorithm that can be applied to a synchronous distributed algorithm to produce a version that operates in asynchronous networks.
Source: Wiktionary