This article is from the sci.lang FAQ, by Michael Covington (mcovingt@ai.uga.edu) and Mark Rosenfelder (markrose@zompist.com) with numerous contributions by others.
Attached to a word, either of 2 things.
An unattested, reconstructed word (such as Indo-European *ekwos);
or an ungrammatical sentence (such as *Himself saw me).
(In a generative rule, such as AP -> Adj (AP)*, it indicates that
an element may be repeated zero or more times.)
 
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