Less than three denotes a heart showing love between two teens. Texting back and forth with words created out of broken and squished words. Back with “ilu,” “ilysfm,” “ily,” “ilusm.” And forth “i<3u,” “ilym,” “ilylc,” “bilu.” Outsiders don’t understand the slang but they don’t know, they do not need to. Only the two who are in love.