State the name of an identifier for a variable that is used to store a Boolean value.
In general, it is recommended to have variable names describe what they contain.

For example, if you have a boolean variable that describes whether something is loaded, you could call your variable isLoaded, hasLoaded or just loaded.

Please note that different languages have different conventions for how variables should be named. For example, in python it's common to have variables in snake_case while in most other languages lowerCamelCase is used.