I love you
Online jargon, also known as text message shorthand, used primarily in texting, online chat, instant messaging, email, blogs, and newsgroup postings, it is spelled in all lowercase because it's also considered a form of leetspeak.
It corresponds to the number of letters in each word: "I" is "1" letter, "love" is "4" letters, "you" is "3" letters.
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NetLingo Classification: Acronyms and Text Message