Answer: PSS
PSS is a crossword puzzle answer that we have spotted 69 times.
Referring Clues:
- They follow signatures
 - They're not part of the body: Abbr.
 - Quick addenda
 - Ends of letters, briefly
 - Ltr. additions
 - They go below signatures, for short
 - Add-ons: Abbr.
 - Some scribbles, for short
 - Letter add-ons: Abbr.
 - Ltr. addenda
 - Letter addenda
 - Letter writer's afterthoughts
 - They follow closings: Abbr.
 - Letter-writers' afterthoughts: Abbr.
 - Supp. writings
 - Certain addenda: Abbr.
 - Letter add-ons, for short
 - Some afterthoughts, in brief
 - Mail addenda, for short
 - Ltr. afterthoughts
 - Brief letter additions
 - Endings to some e-mails
 - Letter addenda, for short
 - Followers of closings: Abbr.
 - Letter addenda: Abbr.
 - They may follow signatures (abbr.)
 - Letter addenda (abbr.)
 - Letter afterthoughts
 - E-mail endings, at times
 - Afterthoughts, briefly
 - Last-min. additions
 - Ltr. extensions
 - Ltr. add-ons
 - Points prev. omitted, perhaps
 - They may follow signatures: Abbr.
 - Letter afterthoughts letters
 - Tire leak sound
 - Ltrs.' appendages
 - Letter addition letters
 - Endings to some letters, for short
 - Letter endings: Abbr.
 - They're usually under signatures: Abbr.
 - They come after signatures in snail mail
 - Letter add-ons (Abbr.)
 - Letter closers?
 - Some email enders
 - Addenda to ltrs.
 - They go below signatures, briefly
 - Epistolary afterthoughts: Abbr.
 - Some addenda, for short
 - Signature followers, for short
 - Letter-writer's afterthoughts
 - Afterthoughts in letters
 - End-of-missive extras, for short
 - Brief afterthoughts
 - BTWs, in letters
 - Ltr. writers' afterthoughts
 - Remarks akin to "btw"
 - Brief afterthoughts, in brief
 - Correspondent's afterthoughts, briefly
 - Additions after closings, in brief
 - Often-overlooked email parts, briefly
 - Additions to ltrs.
 - Letter closers, briefly
 - Extra notes at the end of a letter, initially
 - Email afterthoughts
 - Endings to some emails
 - Message afterthoughts: Abbr.
 - Email addenda, for short
 
Last Seen In:
- LA Times - March 21, 2023
 - LA Times - October 02, 2022
 - New York Times - August 04, 2021
 - LA Times - July 18, 2021
 - LA Times - December 04, 2020
 - New York Times - May 11, 2020
 - LA Times - October 23, 2019
 - Netword - September 08, 2019
 - Universal - May 26, 2019
 - LA Times - January 06, 2019
 - LA Times - June 07, 2018
 - Netword - December 07, 2017
 - USA Today - August 01, 2017
 - New York Times - February 08, 2017
 - New York Times - January 20, 2017
 - New York Times - June 21, 2016
 - Universal - April 02, 2016
 - USA Today - March 31, 2016
 - Netword - December 15, 2015
 - LA Times - October 30, 2015
 
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