Meaning of (ओ एस) o es in english

As noun :
os Ex:  windows 7 is a shareware os
Suggested : Old Saxon
Exampleओ एस का हिन्दी मे अर्थ

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(ओ एस) o es can be used as noun.. No of characters: 4 including vowels consonants. Transliteration : o esa

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