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1.
It's a derivative of "Less than Three" or <3.

Literally, it is: <3.14159265

It can be used when letting someone else know that you heart them, with a special geeky twist.
Wow, I less than Pi you! Nobody <3.14159265es you more than me!
by Methodangel December 31, 2009

Words related to Less than Pi

3.14 awesome less than three pi