In Boolean algebra, the bar sign (-) indicates ....................

The bar sign (-) in Boolean algebra indicates the NOT operation. The NOT operation is a unary operator that negates or inverts a Boolean value. If the input value is "true", the output of the NOT operation will be "false". And if the input value is "false", the output of the NOT operation will be "true". In essence, the NOT operation changes the truth value of the input. This operation is also sometimes referred to as the "complement" or "inverse" operation.