Texter's heart, for one

• Expressive tweet space-savers
• Pictograph in a text
• Text adornment
• Text adornments
• Word derived from the Japanese for "picture writing"
• Infiltrating demo, jingoistic icon
• It may add feeling to a text
• Image of a flexed arm or a thumbs-up sign, e.g

Wiktionary Word definitions in Wiktionary
n. Any of the standardized ideogrammatic icons used in Japanese text messaging (which have since been adopted internationally).

Wikipedia Word definitions in Wikipedia
An emoji (, plural emoji or emojis , from Japanese "emoji", pronounced ) is an ideogram or smiley used in an electronic message or on a Web page . Emoji are used much like ASCII emoticons or kaomoji and exist in various genres, including facial expressions, ...