What is the 'Oxford comma'?
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It's known as the Oxford comma because it was traditionally used by printers, readers, and editors at Oxford University Press. Not all writers and publishers use it, but it can clarify the meaning of a sentence when the items in a list are not single words:
These items are available in black and white, red and yellow, and blue and green.
The Oxford comma is also known as the 'serial comma'.
Find out more about the Oxford comma on the OxfordWords blog
We take a look at several popular, though confusing, punctuation marks.