[^] (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.
Examples
The following example uses the [^] operator to find all the people in the Person table who have first names that start with Al and have a third letter that is not the letter a.
USE AdventureWorks2008R2;
GO
SELECT FirstName, LastName
FROM Person.Person
WHERE FirstName LIKE 'Al[^a]%'
ORDER BY FirstName;