Should one use an apostrophe to indicate that ABC's is plural or is it incorrect?
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Related:What is the correct way to pluralize an acronym? – Mari-Lou A Apr 10 '15 at 7:06
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Also related: The whys and the hows – Mari-Lou A Apr 10 '15 at 7:18
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It's obsolete. Use ABCs, as recommended by Chicago Manual of Style, among many references.
answered Apr 10 '15 at 11:50
