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A number by itself is meaningless. Symbols and labels add meaning in math. Symbols in math are used to represent different operations, and/or add descriptions. There are many different symbols each which have their own purpose. Some symbols have different purposes in different types of math.
In place value, a period is each group of three digits separated by commas in a multidigit number.
both include words in it
they are both grouping symbols in math
They both use calculus in some questions.