The asterisk symbol (*) is the wildcard .
When you put the asterisk after the stem of a word, your search will return documents containing any word beginning with that stem.
For example:
Termin* Search results containing the words termination, terminated, terminal, etc.
Litig* Search results containing the words litigator, litigation, litigious, etc.
Eat* Search results containing the words eat, eaten, eatery,eaters, eating