What are emoticons, and how do they work?
An Emoticon (also referred to as “smiley”) is a sequence of ASCII text characters that forms a rough picture, such as a facial expression. Many mail/news clients have the ability to recognize certain sequences and identify them as emoticons. With SeaMonkey, you have the option of displaying those recognized emoticons graphically. Likewise, when you insert a graphical emoticon into a message that you are composing, what is really inserted is a sequence of text characters.