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On Open Zeppelin's ERC20 BasicToken contract the variable totalSupply_ follows a naming convention I haven't seen before.

Is that to differentiate it from the function totalSupply() below or is there another reason?

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Yes that is precisely why.

If totalSupply_ was named totalSupply it would clash with the function totalSupply() and you would get the following error message:

DeclarationError: Identifier already declared.

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