[^] (Wildcard - Character(s) Not to Match) (Transact-SQL)
Matches any single character that is not within the range or set specified between the square brackets. For more information, see Pattern Matching in Search Conditions.
The following example uses the [^] operator to find all the people in the Contact table who have first names that start with Al and have a third letter that is not the letter a.
USE AdventureWorks; GO SELECT FirstName, LastName FROM Person.Contact WHERE FirstName LIKE 'Al[^a]%' ORDER BY FirstName;