The pre-warp inhabitants of the arid planet Halem'no, who supplement speech with a whistled language and revere the hidden weather towers that keep them alive.
The Halem'nites are the humanoid people of Halem'no, a dry world swept by dust storms. They have no knowledge of other worlds. Alongside their spoken tongue they use whistlespeak, a whistled language that carries over long distances, and their faith centres on a holy mountain they believe brings the rain.
They appear in the fifth-season Discovery episode Whistlespeak. The mountain is in fact one of several weather towers built centuries earlier by a Denobulan scientist, and the last still working. Burnham and Tilly go among the people in disguise to find a Progenitor clue hidden inside it.
Tilly joins a ritual race beside a young woman named Ravah, only to learn that the winners are to be sacrificed. Burnham breaks the Prime Directive, reveals herself to Ravah's father Ohvahz and shows him how to maintain the tower.