Lylas

 Dating back to the 80s, elementary friends started using the term "LYLAS" (Love You Like A Sister) when sending correspondence in classes. This correspondence is not found in today's classrooms. 
Historically, kids used pen, or pencil, and paper. Thumb strains were not as common as they are with today's teens. More hand strains and cramping were an issue, so creating clever acronyms to display ones feelings were becoming more and more popular. 