An argument that is specified as a collection can be:
One or more values. For example, “7,9,583.”
A reference to a single table cell. For example, “B2.”
A reference to a single range or single array of table cells. For example, “B2:B7” or “B2:E7.”
Several references to single table cells separated by operators. For example, “B2+B3+B7.” In Numbers these cell references can be in different tables and in different sheets.
An array returned by an array function.
A collection will have an additional attribute defining the type of values referenced cells can contain.