Freeze frame television: Television in which fixed ("still") images (the frames of the video) are transmitted sequentially at a rate far too slow to be perceived as continuous motion by human vision. For an image of specified quality, e.g., resolution and color fidelity, freeze-frame television has a lower bandwidth requirement than that of full-motion television. For this reason, NASA, which refers to this technique as sequential still video, uses it on UHF when Ku-band full-motion video signals are not available. Source: from Federal Standard 1037C
