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I have seen many tutorials on programming an Arduino to control a HC-05 bluetooth module. In that I did not understand the term called 'flag'. What does that mean?

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And what is the context of this word? – Majenko Apr 22 '16 at 15:09
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"Flag" is usually a feature that you can turn on or off. The "flag" is the variable that you need to use to do that. But as Majenko stated, with no context, it's just a guess I am taking here. – fabrosell Apr 22 '16 at 15:10
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I've always used flag to indicate a boolean logic value. I would also suggest this is an archaic term.

Was going to come up with my own explanation but found the following at In C language, what does flag mean?:

A 'flag' is a variable that is supposed to signalize something. Think about the word itself - flags are used in sending signals. In our world of programming a basic boolean flag can either be "up" or "down", either true or false.

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