Post postscriptum (additional postscript), or abbreviation for various terms like Public-Private Partnership or Personal Protection System.
From Latin 'post postscriptum' meaning 'after the postscript,' following the same pattern as 'PS' (post scriptum). The multiple modern meanings developed as organizational and technical acronyms in the 20th century.
PPS represents the delightfully redundant nature of human communication - after writing a letter, adding a postscript, you might realize you have even more to say. In the digital age, this concept lives on in emails where people add multiple 'PS' notes or edit messages after sending.
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