@saab,
Ha! skin disease . . . i like that.
POTUS means President of the United States, and SCOTUS means Supreme Court of the United States. However, when making abbreviations in English, conjunctions, articles and prepositions are not included in the abbreviation. As an example, AFL-CIO stands for
the American Federation
of Labor--Congress
of Industrial Organizations--the underlined words are not included in the abbreviation. I suspect that "POTUS" was dreamed up by bone-heads in the Secret Service, and then repeated by people like Tom Clancy who wanted to sound like insiders. I'm sure that SCOTUS was just a case of expanding the idiocy.