Appearing in the anime FLCL OVA on the front of Haru Haruko's (caricature) yellow vespa, a white letter "P" and exclamation point encircled in black is widely accepted as a logo representing the Japanese rock group "The Pillows."

Was it created by the animators as spontaneous endorsement? Is it an infamously old band logo resurfaced? Originally some confused representation of Piaggio-Vespa? probably the most former, everyone seems to be going with it.

While not popularly recognized in it's own country, "P!" seems to have a runaway success story in the United States due to the promotion of American anime and J-rock fans alike- the result being that FLCL, The Pillows and the "P!" logo seem to carry a synonyms relationship.

An emoticon expressing an evil desire to see whoever it has been sent to, uncomfortable, hurt, displeasured, annoyed, etc. Also a signifier of inner laughter at their misfortune.

An emoticon showing a tongue protruding from one's face. This can often be disrespectful, or simply a way of being cute.

Slang term for Anatomy and Physiology combined courses, typically a 200-level biology class. Commonly referred to as the reason you can't do anything fun.

An emotocon meaning "im coming over to eat your pussy"

The winky face is important because you always need to keep one eye open

:P is quite possibly one of the most clean and innocent emoticons to ever exist. You ideally would add this towards the end of your sentence to convey a sense of playfulness and lightheartedness, especially when the things you've said can come off as a bit inappropriate/insensitive if interpreted the wrong way.

NOTE: this text-based emoticon CANNOT be substituted for the emoji equivalent of a tongue sticking out (especially not the standalone tongue, dear god no).

It's the 16th letter in the alphabet.