I've only ever seen this practice used to refer to "Operating System" with "O/S", but according to The Free Dictionary there are a few more. Why is the slash in the middle sometimes used? Isn't "OS" or "O.S." more appropriate?
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2Welcome to EL&U. Depending on the style in use, in fact, OS or O.S. may be preferred to O/S. The slash is an older convention and more common in British usage than American, and helps distinguish that the two or three letters it separates are an abbreviation rather than a short word or personal initials. See Why is there a slash within "n/a" and Where does A/C abbreviation for aircraft come from?, as well as Using slash (/) as an abbreviation. – choster Nov 26 '18 at 17:45
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Thank you for linking to the question about n/a choster. I searched for a similar question but couldn't find anything. – Mossmyr Nov 26 '18 at 18:33
