Final answer:
The logical NOT operator is a unary operator that reverses the logical value of a Boolean expression.
Step-by-step explanation:
The logical NOT operator is represented by the exclamation mark (!) in programming languages such as Java, C++, and Python. It takes a Boolean expression as its operand and reverses its logical value. For example, if the original Boolean expression is true, applying the logical NOT operator will result in false. Conversely, if the original Boolean expression is false, applying the logical NOT operator will result in true.