Wildcards are similar to truncation but they are used to substitute for a single letter or no letter in a word. They are useful for irregular plurals and for British/American English spellings. They broaden your search by including variant word spellings.
The question mark symbol is most commonly used.
For example:
wom?n will search and find woman and women
behavio?r will search and find behaviour and behavior
model?ing will search and find modeling and modelling
organi?e will search and find organise and organize
