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The symbol used before a number to make it a label is a hash sign (#).
Infinity is not "the" number symbol. It is simply a symbol that represent the limit of very large numbers and saves people from having to write that long phrase every time.
Write an apostrophe ( ' ) in the cell, before the number.
The symbol for 6 in Roman numeral is "VI".
Any mathematician will use the number pi (and its symbol) sooner or later - it is a number used extensively in many different areas of mathematics.