In subspace physics, subspace harmonics described a series of oscillations.

According to the Engineering Systems Database, there was an association between subspace harmonics and the warp field generated by a Federation starship. These ships monitored harmonics with subspace harmonic monitors. (TNG: "Booby Trap", display graphic)

Subspace harmonics were among the components of a warp signature. (DS9: "Defiant")

A subspatial transkinetic analysis used an algorithm based on subspace harmonics. (VOY: "Counterpoint")

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