What does [:3] mean?
In the census menu, in front of each and every kitten there is [:3]. What is this and what does it mean?
:3 is a common internet "smiley" for a cat-face.
Not sure if urbandictionary links are cool around here, so here's a big warning/disclaimer: the linked page shouldn't have anything bad on it, but it is a link to urbandictionary, so clicker beware!
:3 denotes a cat's face smiley.