Why are Red Sox and White Sox spelled Sox?

Why are Red Sox and White Sox spelled Sox? The teams were originally called the Red Stockings and White Stockings, but headline writers, needing a shorter alternative, quickly turned to the phonetic spelling Sox (for Socks).

The teams were originally called the Red Stockings and White Stockings, but headline writers, needing a shorter alternative, quickly turned to the phonetic spelling Sox (for Socks).
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