L.S.

Noun

 * 1)  (Latin: “(a/the) place of (a/the) seal”)
 * 2)  (Latin: “the reader be greeted”, “greetings to the reader”)

Usage notes

 * Typically surrounded by brackets and used in place of a seal for authenticating documents.
 * Used as an initial greeting in letters and books.

Etymology
, from.

Phrase

 * 1)  greetings to the reader, lectori salutem

Usage notes
This initialism is almost exclusively found in the salutation part of letters. One of its benefits is that both the name and the gender of the reader remains unspecified and thus it is an easy way to address either an unknown male or female reader. While this initialism can still be encountered on rare occasions, it is dated if not archaic, and not all readers will understand it. More common is for example "Geachte heer, geachte mevrouw" (Dear Mr, dear Mrs).