!< (Not Less Than) (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Compares two expressions (a comparison operator). When you compare nonnull expressions, the result is TRUE if the left operand does not have a value lower than the right operand; otherwise, the result is FALSE. If either or both operands are NULL, see the topic SET ANSI_NULLS (Transact-SQL).
Transact-SQL syntax conventions
Syntax
expression !< expression
Arguments
expression
Is any valid expression. Both expressions must have implicitly convertible data types. The conversion depends on the rules of data type precedence.
Result Types
Boolean