Truncation is like a wildcard. Added to the stem of a word, it will find that stem plus anything that comes after it. The symbol used to truncate a word depends upon the index, database, or Web search engine you are using.
|psychol*||will return records on psychology, psychological, psychologist.
* is a common truncation symbol used to stand for any number of characters.
|wom?n||will return records on women, woman.
? is a common truncation symbol used for internal truncation to stand for exactly one character or an exact number of characters as shown in the example below.
|psych????y||will return records on psychology, psychiatry, but not psychoanalysis.|