Polite online letters

This crossword clue is for the definition: Polite online letters.
it’s A 21 letters crossword puzzle definition.
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Possible Answers: PLS.

Last seen on: LA Times Crossword 15 Jul 2018, Sunday

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Random information on the term “PLS”:

The Pioneer Library System (PLS) is a public library system that serves residents in the central Oklahoma counties of Cleveland, Pottawatomie and McClain with administrative offices in Norman.[3] The eleven-branch system is governed by a board of trustees and currently administered by Executive Director Lisa Wells.[2]

The cities of Moore, Norman and Shawnee are served by Redbox-style “library vending machines”, with a location in Norman reportedly the first such machine in the United States with 24-hour access.[4][5]

Information about the system’s administrative offices and branch libraries is shown below.[2] For maps showing all locations, see the “External links” section.

PLS on Wikipedia