A symbol used when someone uses a 4 instead of a 3 when making a heart symbol <3. This can be done on accident making the user look stupid or it can be done on porpose meaning the user more than <3's them.
Tiffany - "Okay. See you then - <4"
Mike - "You're an idiot."
Jen - "I love you more than anything in the world. <4"
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