Although this is not very common, some databases do allow you to use a symbol (often the ? or the !) to substitute for a missing letter (or letters) when you are not sure what that letter might be. For example, organi?ation will find both organisation (spelt with an s) and organization (spelt with a z).
Do be aware that some databases refer to what we have called truncation as being a wildcard search. Google, for example, uses the asterisk, but refers to this as a wildcard symbol.
Let's now look at the third Boolean operator, NOT