Usually associated with vibration wave modes. Transverse Wave is 90° to the Longitudinal Wave.
CityU physicists discovered special transverse sound wave
By the year 1821, Fresnel was able to show via mathematical methods that polarization could be explained by the wave theory of light and only if light was entirely transverse, with no longitudinal vibration whatsoever." https://en.wikipedia.org/wiki/Light#Wave_theory