LTR is a common abbreviation, with multiple sense related to it, depending on the context of application.
It may be used as an abbreviation for the words later or letter.
Alternatively, “LTR” may stand as an acronym for “Long-Term Relationship”.
Origin of the term
Like most acronyms and abbreviations, the origin of “LTR” is shrouded in the mystery of the early internet, where it was conceived by the users encountering with each other on forums, message boards and chat rooms, as well as dating sites.
It started emerging online in the mid 1990’s.
Spread of the term
The acronym was first defined on Urban Dictionary in 2002, with a large amount of entries having been written since then.
Its use online would spread with the growth of digital communication in the 2000’s.
The appearance of SMS technology and later social media all helped popularize the acronym.