Final answer:
The use of the plus sign (+) to denote public data or methods in programming is incorrect. In programming contexts, access modifiers like 'public' are used instead.
Step-by-step explanation:
The statement that you use the plus sign (+) to denote public data or methods is False. In object-oriented programming languages like Java or C++, the plus sign is not used for this purpose. Instead, the plus sign is typically used in mathematics to indicate addition or in chemistry to separate individual reactant and product formulas in a chemical equation. For denoting public data or methods, most programming languages use the keyword 'public' or similar access modifier, not a plus sign.