The OCL Operator ASCII refers to the set of symbols and characters used to specify constraints on objects in software development.

ASCII includes symbols such as +, -, *, /, <, >, =, <=, >=, !=, and logical operators such as and, or, not, xor, implies, etc.

These operators are used to define constraints on objects in a precise way. For example, if we have an object representing a person with attributes such as name, age, and address, we could use the OCL Operator ASCII to specify that the age of the person must be greater than or equal to 18 or that the person's address must not be null.