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Emoji: The Complete History, From Japanese Phones to Unicode

Emoji began on Japanese mobile phones in 1999. Follow their evolution into Unicode, and learn what the standard defines—and why vendors still draw them differently.
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Emoji first appeared on Japanese mobile phones in 1999. Their path from incompatible carrier-specific pictographs to a shared international standard was driven by a practical problem: messages needed to survive when sent between different phones and services. Unicode standardized the characters and sequences used to exchange emoji—not one universal set of pictures. The artwork on screen is still drawn by each platform’s own fonts and software.

What emoji are—and how they differ from emoticons

The word emoji comes from the Japanese characters 絵 (e, picture), 文 (mo, writing) and 字 (ji, character). In Unicode terminology, an emoji character is encoded text; a device or application then displays it as a visual glyph.

An emoticon, by contrast, is made from ordinary text characters arranged to suggest an expression or gesture, as in ;‑). Emoticons predate emoji, although some software converts typed emoticons into emoji during input. Emoji can also be represented by sequences of encoded characters, rather than by a single character.

How emoji began on Japanese mobile phones

Unicode dates emoji availability on Japanese mobile phones to 1999. Japanese carriers developed their own collections of pictographs. The sets overlapped in part, but they were not identical, and carriers used incompatible text-encoding extensions. A pictograph sent from one service could therefore be mapped incorrectly, dropped, corrupted or shown as a replacement mark on a receiving device that did not support it.

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The standard’s historical account records an April 2000 proposal to encode NTT DoCoMo pictographs. It did not lead to action at the time: broader use was uncertain and carrier support was lacking. The problem became harder to ignore as people and services needed to exchange messages across platforms.

How Unicode brought emoji into a shared standard

2006–2007: Interoperability work begins

Unicode says Google began work in 2006 to map Japanese emoji to Unicode private-use codes. In May 2007, a proposal to expand Unicode’s symbol scope to include emoji was approved; in August, the technical committee agreed to support encoding emoji.

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2009–2010: The first large standardized set

Unicode 5.2, released in 2009, added the first characters explicitly intended as emoji, to support interoperability with pictographs associated with ARIB. Unicode’s historical account describes an initial union of 722 emoji characters used by Japanese mobile-phone carriers: 114 were already in Unicode 5.2, and 608 more were added in Unicode 6.0 in 2010. That figure describes a historical set, not today’s total.

2012 onward: Additions and versioning

Unicode 6.1 added a few emoji in 2012, and Unicode 7.0 added a larger number in 2014. Further additions followed Unicode’s proposal-selection process. Unicode’s current specification describes the official Emoji 1.0 release in 2015. From Emoji/UTS version 11.0, the emoji repertoire is synchronized with the Unicode Standard and follows the same numbering system.

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The current UTS #51 version table extends through Emoji 18.0. A standard’s release does not mean every phone or app supports its additions immediately: platform rollouts can lag, and the design can differ from one vendor to another. Check the relevant platform’s support as well as the Unicode release when a particular emoji’s availability matters.

What Unicode standardizes—and what it leaves to platforms

Unicode defines emoji characters and sequences, maintains related data, and documents behavior such as default text or emoji presentation and the use of skin-tone modifiers. Those rules help systems interpret and exchange encoded text. They do not prescribe one identical colored image for every device.

The distinction is between a character and its glyph. The character is the encoded text; the glyph is the visual form used to display it. Unicode’s charts use representative illustrations, while platform vendors create and implement the artwork in their own fonts and software. A shared character identity makes interchange possible without requiring the same pictorial style everywhere. Unicode also notes that some pictographs in its history were influenced by sources including ARIB, Japanese carrier sets, and Wingdings and Webdings.

Some characters normally appear in emoji style, some normally appear as ordinary text, and some can be shown either way. Unicode documents presentation mechanisms to guide that choice. A sequence may also depend on multiple encoded characters; if a system does not support a sequence, it may display it differently from a newer or more capable system.

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Why there is no single definitive emoji count

A total depends on what is being counted: individual code points, multi-character sequences, components, or characters that can receive emoji presentation are different measures. Unicode’s specification also says there is no clear boundary between pictographic characters shown in typical emoji style and other characters. So a useful count must name its publisher, release and counting method; a bare claim about “how many emoji exist” can obscure what is included.

What emoji can—and cannot—do in writing

Emoji can add color, feeling or emphasis to a short message, and can stand in for cues such as facial expression, gesture or intonation that plain text does not convey. But they are not a replacement for language. Unicode’s UTS #51 puts it directly: “Emoji do not have the grammar or vocabulary to substitute for written language.” Their meaning still depends on context, and the image a reader sees may vary by platform.

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