Happy face, e.g

• The Oxford Dictionaries 2015 "Word" of the Year is one
• Picture in a text message
• Face in a text, e.g
• Face blowing a kiss, e.g
• Small image used in Facebook chats
• Smiling pile of shit or crazy devil mask, for example
• Pictorial symbol in a text message
• Texter's heart, for one
• Texting icon

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