Emoji: "A small digital image or icon used to express an idea, emotion, etc., in electronic communications."
Source: Oxford English Dictionary
Emoticon or Emoji?
Emoticon: "An emoticon is a computer keyboard-generated sign that represents facial expressions. Used in computer-mediated communication, emoticons provide an emotional quality to e-mails, texts, instant messaging, and other Internet communication."
Source: Margo DeMello. Santa Barbara, CA: ABC-CLIO, 2012. p80-83. Gale Virtual Reference Library
Pictograph: "A method of expression and communication that uses symbols and drawings to convey ideas. The pictograph refers to the symbol(s) used to express these ideas. Ancient hieroglyphs used pictures as a method of communication and are a well-known example of pictographs."
Round-topped limestone stela divided into four registers
British Museum, Creative Commons License CC BY-NC-SA 4.0