6.3.3. Region, Clip, or Segment
Region, clip, and segment are synonyms: different software uses a different word to refer to the same thing. A region (or clip or segment) is the portion of audio recorded into one track during one take. Regions are represented in the main DAW interface window as a rectangle, usually coloured, and always contained in only one track. Regions containing audio signal data usually display a spectrographic representation of that data. Regions containing MIDI signal data usually displayed as matrix-based representation of that data.
For the three DAW applications in the Musicians' Guide:
Ardour calls them "regions,"
Qtractor calls them "clips," and,
Rosegarden calls them "segments."