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.ps, filename extension for a file in PostScript format; ps (Unix), an application that displays statistics on running processes.ps, the State of Palestine Internet domain extension or top-level domain (ccTLD) PS Power and Sample Size, an interactive computer program for power and sample size calculations
PS post scriptum "after what has been written", "postscript" Used to indicate additions to a text after the signature of a letter. Example (in a letter format): "Sincerely, John Smith. PS Tell mother I say hello!" PPS post post scriptum "post-postscript" Used to indicate additions after a postscript.
Abbreviation Meaning p̄: after (from Latin post) [1] [letter p with a bar over it] pH Potential of Hydrogen - Acidity of a fluid P: parturition (total number of live births) phosphorus pulse [1] post P OSM: plasma osmolality PA: posterior–anterior, posteroanterior pulmonary artery [[physician assistant or associate [2]]] psoriatic arthritis ...
initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee; pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
In a letter, PS stands for post scriptum, from which we get postscript. As you suggest, it's used for adding an afterthought, sometimes of a more personal nature. It originated in letter writing, where one wouldn't be able to physically alter what had gone before to accommodate new ideas, changes of opinion or new events.
Psi / ˈ (p) s aɪ, ˈ (p) s iː / (P)SY, (P)SEE [1] (uppercase Ψ, lowercase ψ or 𝛙; Greek: ψι psi) is the twenty-third and penultimate letter of the Greek alphabet and is associated with a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination /ps/ (as in English word "lapse").
Anti-reflection coating of lenses to reduce transmission losses. May also stand for meter coupling or meter-coupled lenses. Whilst being a generic term, the designation in the latter meaning is mostly used to describe a generation of Minolta SR-mount lenses implementing this feature. MDF or MFD: Minimum Focusing Distance. Minimum distance from ...
PS—PostScript; PS/2—Personal System/2; PSA—Professional Services Automation; PSM—Platform Specific Model; PSTN—Public Switched Telephone Network; PSU—Power Supply Unit; PSVI—Post-Schema-Validation Infoset; PTS-DOS—PhysTechSoft – Disk Operating System; PV—Physical Volume; PVG—Physical Volume Group; PVR—Personal Video Recorder