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A framed unit used to hold flats or other scenery in a vertical orientation.

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http://www.colby.edu/personal/j/jdervin/Other/tips.html

From http://www.northern.edu/wild/th241/sc96.html :
A jack is an uncovered three-sided flat containing a stile which is at least two-thirds the height of the flat, a bottom rail (one fourth the height of the flat), and a diagonal brace. Typically the jack is screwed (or hinged) to the back of the flat and secured to the floor with an L bracket or 2x4 block.
OR weighted with sandbags or stage weights.
jack-weight-jpg.4435


See also stage brace, tip jack, and lift jack.