A pair of parentheses is used to "enclose" numbers or letters in a series or elsewhere when enclosure is useful to understand the meaning. However, to separate the items in a series, only a comma and space after each item is needed, along with a conjunction to close the series. Examples: 1, 1, 2, and 3 are the first four numbers of a Fibonacci series; paragraphs (A), (B)(2), and (D) are the most relevant ones for this discussion.
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comma
The Romans did but these letters or numerals represented numbers.
Literal numbers are the letters which are used to represent a number.
The # 1 is I in the roman numeral letters and it is how the Romans used numbers.
The Morse code