A relationship between two expressions that are not equal, often written in the form of an equation but using the symbols > or < meaning is greater than and is less than. If the end values are included then the symbols (greater than or equal to) or (less than or equal to) are used. If there is a great difference the expressions then the symbols >> or << are used.
(greater than or equal to) or 
(less than or equal to) are used. If there is a great difference the expressions then the symbols >> or << are used.