Names in Calc can contain letters, numeric characters, and some special characters. Names must start with a letter or an underline character.
Allowed special characters:
period (.) - allowed within a name, but not as first or last character
blank ( ) - allowed within a name, but not as first or last character, and not for a cell range
Names must not be the same as cell references. For example, the name A1 is invalid because A1 is a cell reference to the top left cell.
Names for cell ranges must not include blanks. Blanks are allowed within names for single cells, sheets and documents.
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