emoticon

Short definition from Wiktionary

Noun

1. 1
   A graphical representation of a particular emotion of the writer, used especially in SMS, email, or other electronic communication: A graphic made up of text characters to represent such emotion; a smiley.
2. 2
   A graphical representation of a particular emotion of the writer, used especially in SMS, email, or other electronic communication: An image or graphic icon used to represent such emotions; an emoji.