The Meaning of Postscript
In a happy coincidence, my initials are P.S., a term that has a special relevance to storytelling. A postscript, abbreviated P.S., is a note added after the main body of a letter (or other body of writing). The term comes from the Latin post scriptum, an expression meaning “written after”.
A postscript may be a sentence, a paragraph, or occasionally many paragraphs added, often hastily and incidentally, after the signature of a letter or (sometimes) the main body of an essay or book.
A P.S., although an afterthought, is often the flash of brilliance or the key idea that occurs to the writer at the end of a story of any kind from an e-mail to a 300-page novel.