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- He seemed to query every damn comma .
- He wouldn't change so much as a comma in a medical report to please anyone .
- Is a list of comma - separated name - value pairs
- Multiple expression clauses are separated by commas
- Traditonally , both use commas to get this join
The comma is a punctuation mark, and it appears in several variants in various languages. It has the same shape as an apostrophe or single closing quotation mark in many typefaces, but it differs from them in being placed on the baseline of the text.