Amusing counter argument, but the pendant in me wants to point out that the DOS-name was inherited from the SCP product MS bought[1] rather than a naming convention MS created<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;86-DOS" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;86-DOS</a>