Ekkyklema

literally a 'thing rolled out'; in a theater, a platform rolled out on wheels through one of the doors of the skene on which a tableau was displayed representing the result of an action which had taken place indoors and therefore was unseen by the audience.
Found on http://www.encyclo.co.uk/local/10135

Ekkyklema

An ekkyklêma (ə; εκκύκλημα; `roll-out machine`) was a wheeled platform rolled out through a skênê in ancient Greek theatre. It was used to bring interior scenes out into the sight of the audience. Some ancient sources suggest that it may have been revolved or turned. It is mainly used in tragedies for revealing dead bodies, such as .....
Found on http://en.wikipedia.org/wiki/Ekkyklema
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