Joker from a deck of cards.
Truncation and Wildcards

Truncation is a way of retrieving multiple search terms with one shortened term. Added to the stem of a word, it will find that stem plus anything that comes after it. You may use a Wildcard to substitute a symbol for a letter within a word. Wildcards are helpful when you don't know the correct spelling of a word. The symbol used to truncate or wildcard a word depends upon the database or Web search engine you are using.

environ* will return records on environment, environments, environmental.
* is used as the truncation symbol in the STLCC Library Catalog, Thompson-Gale databases and LexisNexis. Note: some databases or search engines assume automatic truncation.
einst??n will return the correctly spelled einstein (albert einstein)
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