It's likely you're thinking of a few common comma usage rules that could be misinterpreted as such:
1. The Oxford Comma:
* This rule dictates using a comma before the conjunction "and" in a list of three or more items. For example: "I bought apples, bananas, and oranges."
* It's called the Oxford comma because it's commonly used in Oxford University Press publications.
* This rule is a matter of style and can be debated; some style guides recommend it, while others don't.
2. Commas in Compound Sentences:
* When combining two independent clauses (complete sentences) using a coordinating conjunction (for, and, nor, but, or, yet, so), a comma is placed before the conjunction. For example: "I went to the store, but I forgot my wallet."
3. Commas for Non-restrictive Phrases:
* A non-restrictive phrase provides additional, non-essential information. It's set off by commas. For example: "My car, which is red, needs a wash." The phrase "which is red" is not essential to understanding the sentence.
4. Commas for Appositives:
* An appositive is a noun or noun phrase that renames or explains another noun. It's set off by commas. For example: "My friend, John, is coming over." The phrase "John" renames "My friend."
To clarify your question, please provide more context or an example sentence you're thinking of. This will help me understand what you mean by "comma, comma" and give you a more accurate answer.