Back of Envelope refers to a mail-themed Unicode symbol concept and emoji-style candidate centered on the reverse side of a paper envelope. It was part of the broader set of office, communication, and document pictographs discussed during the period when many legacy symbol characters and emoji candidates were being evaluated for modern platforms. Unlike the standard Envelope emoji, E-Mail emoji, Incoming Envelope, Envelope with Arrow, or Love Letter, Back of Envelope never became a commonly supported, officially recommended colorful emoji for everyday emoji keyboards. It is best understood as a proposed or considered pictographic symbol rather than a mainstream approved emoji character with consistent cross-platform presentation.
The intended meaning would likely have included postal mail, sealed correspondence, private messages, invitations, paperwork, or the physical act of sending a letter. It could also have carried a symbolic connection to the phrase "back-of-the-envelope calculation," meaning a quick estimate, rough plan, or informal bit of math. Online, such an emoji might have been useful in jokes about quick budgeting, amateur analysis, secret notes, old-fashioned communication, or bureaucratic paperwork. People may have wanted it because existing envelope emojis mostly show the front, email, incoming mail, or romantic letters, while the back view suggests sealing, privacy, or handwritten mail in a more literal way. There is no widely known official Apple Color Emoji design specifically for Back of Envelope; in concept art or Apple-style mockups it would likely appear as a white or cream envelope viewed from the rear, with grey diagonal flap lines, a clean rectangular shape, subtle shading, and no face or extra decoration.
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Emoji History The emoji code/ image log of changes.
This emoji was one of the "suggested emojis" the Unicode group unveiled in June 2014 [article], however, it has been, and still is, up to the companies who support emoji in their operating systems to provide not only images but also an algorithm to replace the emoji code into the emoji image.
