Smiley Face :) or the Frowny Face :( PC Emoticons, Messenger :)

An emoticon is a symbol or combination of symbols used to convey emotional content in written or message form. The word is a portmanteau of the English words emotion (or emote) and icon. In web forums, instant messengers and online games, text emoticons are often automatically replaced with small corresponding images, which came to be called emoticons as well. Examples of well known emoticons are the smiley face or the frowny face

Early emoticons go back to the 1800s and commonly arose when casual/humorous writing was common. The emoticons on the Internet can largely be traced back to a proposal by Scott Fahlman in a message of 19th September 1982.