Oscillation
Oscillation was a repetitive movement between different states at regular intervals.

An oscillator was a type of electronic circuit that produced oscillations. ()

An oscillation overthruster was a device in Soong-type androids such as Data. ()

Subspace oscillation was a periodic variance in subspace. A series of these was called subspace harmonic. ()

In 2366, after William T. Riker and Deanna Troi escaped from a Ferengi brig aboard the Krayton, Riker attempted to alert the  but was denied access to Ferengi communications as all transmissions had to be authorized by DaiMon Tog. Riker then set up a simple oscillation to send out a signal, a message that the Enterprise would understand but the Ferengi would think was normal subspace static. ()

After entering a subspace distortion in 2367, the Enterprise-D experienced a quantum level oscillation delay which doubled in intensity every 12.3 seconds. Bio-cellular disruption would have been imminent had they not exited the subspace distortion. ()

See also
Brain wave pattern

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Science
Mathematics