Awhile back I wrote up a blog post about some unusual gamer emoticons: o/, \o/, qq, and O.o. Recently my Warcraft guild is favouring a new emoticon with some variants.
<3 is a little sideways heart, to express love. Usually used ironically in response to a bitchy joke, or in apology for making said bitchy joke. Variants include </3 for a broken heart, <$ to convey a financial motive for love, and <4 as the superlative of <3.