Shutter priority is marked on camera dials by the letters "TV", standing for time value. This preset allows the photographer to control the shutter speed while the camera readjusts the aperture (and sometimes film speed) to maintain a midrange exposure.
This setting is very useful in action settings and for night photography when the shutter speed needs to be accurately controlled.
Preset Camera Modes
By Liz Masoner, About.com Guide
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