This chapter focuses on the technical aspects of emoji, including how emoji are encoded and rendered for use in digital communication. The chapter explains how emoji are developed by the Unicode Consortium as well as considering the social implications of this process. Unicode characters, and emoji codepoints, modifiers, and sequences are explained. The chapter also deals with emoji design and aesthetics, and explains how emoji are visually rendered as glyphs by different ‘vendors’ such as social media platforms. The chapter then examines the role of semiotic technologies in both enabling and constraining the ways they are used. It concludes by discussing the implications of emoji encoding and rendering on corpus construction, annotation, and concordancing.

This chapter introduces the study of emoji as a form of social media paralanguage. It delves into the semiotic versatility of emoji as ‘picture characters’ enabling users to express a wide range of meanings through their use with language in social media communication. The book approaches emoji as a form of paralanguage due to their close dependency on the meanings conveyed in their written co-text and their social context. The chapter highlights the significance of the social semiotic perspective to emoji-text relationships adopted in the book with its focus on understanding how they converge with the meanings made in other semiotic modes. It concludes by introducing the structure of the book and the focus of the upcoming chapters on both emoji-text relations and social affiliation.