Shigetaka Kurita Made 176 Emoji on a 12x12 Pixel Grid in 1999. There Are Now 3,600.
Shigetaka Kurita Made 176 Emoji on a 12x12 Pixel Grid in 1999. There Are Now 3,600.
In 1999, a designer at NTT DoCoMo named Shigetaka Kurita created 176 small images on a 12-by-12 pixel grid. The images were meant to supplement the mobile internet service DoCoMo was launching for Japanese consumers, a way to convey weather, emotions, and concepts that would have required several words to express as text. The set included a heart, a sun, clouds, an exclamation point, and a range of faces. Kurita drew on manga visual conventions, public domain pictograms, and a typeface called Zapf Dingbats for inspiration.
Those 176 characters were never meant to travel beyond Japan's mobile network. They became the foundation for every emoji in use today.
The word emoji combines the Japanese words for picture (e) and character (moji). The visual similarity to the English word "emotion" is coincidental, but the confusion has helped the word stick in English-speaking markets. Kurita's original 12x12 grid imposed severe constraints: 144 pixels to represent a concept clearly enough that a reader would recognize it on a low-resolution mobile screen. That constraint forced abstraction over realism, which is part of why the resulting images remained legible even as screens became sharper.
Other Japanese mobile carriers developed their own emoji sets after DoCoMo, and incompatibility between carriers became a problem: a character sent from one network would appear as a broken box on another. Google engineers Takeshi Kishimoto and Motoi Nakanishi, along with Apple engineers Yasuo Kida and Peter Edberg, recognized that emoji needed a universal encoding system.
In 2007, Google submitted an initial draft proposal to the Unicode Consortium. In March 2009, Kida and Edberg filed a formal proposal for 625 emoji characters. The Unicode Consortium, the nonprofit organization that maintains the encoding standard used by every programming language and operating system, accepted the proposal, and Unicode 6.0, released in October 2010, included 722 emoji as standardized characters.
Unicode assigns each emoji a code point, a unique identifier in the same system used for every letter in every language. U+1F355 is the code point for a pizza slice. U+2764 is the red heart. What those code points look like visually is left to each platform: Apple designs its own emoji artwork, as do Google, Microsoft, Samsung, and others. This is why the same emoji can look substantially different depending on whether you are on an iPhone or an Android device.
Apple added emoji keyboard support to iOS 5.0 in October 2011, making the characters accessible to iPhone users worldwide. The Japanese release of iOS 2.2 in 2008 had included an emoji keyboard for that market, but the 2011 expansion to global users drove adoption across English-speaking countries. By 2012, emoji were appearing in marketing materials, news headlines, and casual communication across every platform.
The process for adding an emoji to the Unicode standard is more formal than most people expect.
Anyone can submit a proposal to the Unicode Emoji Subcommittee. A strong proposal must include evidence of expected usage frequency, drawn from sources like Google Trends and dictionary evidence, a demonstration that the concept is distinct from existing emoji, evidence of broad cross-cultural relevance, and an argument for why the concept cannot already be represented by a combination of existing emoji using Zero Width Joiner sequences.
The Emoji Subcommittee meets twice per week. Proposals advance through five formal stages, with most candidates rejected at the first stage. The full review cycle takes roughly two years from submission to inclusion in a Unicode release. This explains why the number of emoji grows steadily but not explosively: new additions in a given year typically number in the dozens, not the hundreds.
Emoji 1.0 in 2015 catalogued 1,282 characters. Emoji 15.1 in 2023 brought the total above 3,600. Some of the most commonly requested categories over the years have been food items, animals, hand gestures, and flags. The face-with-tears-of-joy emoji has been documented as the most frequently used single character on Twitter and has appeared in Merriam-Webster's descriptions of contemporary written communication.
The practical problem with a library of 3,600 characters is navigation. Early emoji keyboards displayed characters in a fixed grid with broad category tabs: smileys, animals, food, travel, objects, symbols, flags. Finding a specific character required either knowing its rough category or scrolling through dozens of options until you spotted what you wanted.
Search by keyword changed the experience fundamentally. If you type "check" in an emoji search field, you find check marks in multiple styles. If you type "coffee" you find the hot beverage, the takeaway cup, and related options. If you type "star" you find a dozen variations across different categories. Keyword search reduces navigation from a browse problem to a lookup problem.
The Unicode Consortium maintains official short names and keywords for every emoji, which power search in most implementations. A character like the magnifying glass (U+1F50D) carries keywords including "glass," "look," "magnifying," "search," and "tool." These keyword lists are updated with each Unicode release.
Unicode 13.0 in 2020 added 67 new emoji including bubble tea, a pinched fingers gesture, and a polar bear. Unicode 14.0 in 2021 added 37 more, including a coral, a biting lip, and a troll. Each addition expands the lookup vocabulary that search-based pickers must index.
When designers and developers talk about emoji compatibility, they are usually referring to two separate issues: whether a given code point is supported by the rendering platform, and whether the visual design matches user expectations across platforms.
A character included in Unicode 15.1 may not yet be rendered by all platforms. If you send U+1FADA (a leafless tree, added in 2023) to a user on an older Android version, they may see a blank square instead of the intended image. This is called the "tofu" problem, named after the appearance of the blank square. Platform support typically lags Unicode releases by six to eighteen months for major characters and longer for less common ones.
The visual design differences between platforms are more subtle but have real consequences in professional communication. The pistol emoji (U+1F52B) changed from a realistic revolver to a water gun on Apple platforms in 2016, and Microsoft and Google followed suit. The same code point now renders as a toy on most major platforms but still as a realistic weapon on some older systems. For community managers, content moderators, and developers building cross-platform communication tools, these differences require careful testing.
Research from the University of Amsterdam and other institutions has examined how emoji affect the perception of written messages. A 2017 study published in the journal Social Cognition found that emoji reduce perceived coldness in digital communication without necessarily changing the informational content. A follow-up analysis of customer service interactions found that agents who used appropriate emoji in responses received higher satisfaction scores than those who did not, though the effect reversed when emoji were perceived as inappropriate for the context.
Brands have incorporated emoji into email subject lines since at least 2012. Return Path, an email analytics firm, published research showing that subject lines containing a single relevant emoji had higher open rates than plain text subject lines in controlled experiments, though the effect diminished as emoji in email became more common. By 2016, the novelty of an emoji in a subject line had largely disappeared, and the relevant question became whether the character fit the brand voice and content.
Conclusion
Kurita's original 176 characters were a practical solution to a specific engineering constraint: how to represent complex ideas on a 12-by-12 pixel grid for a mobile network. The Unicode standardization process transformed that solution into a global communication layer with over 3,600 characters covering concepts from animals to zodiac signs to skin tone modifiers for human figures.
Finding a specific character from that library is the problem the emoji picker solves. Search by keyword, copy with one click, and the character is ready to paste into any platform that supports Unicode text. The picker covers the full Unicode emoji set, searchable by the official Unicode keyword lists, so you can find the troll, the bubble tea, or the leafless tree as quickly as you can find the classic red heart.
Frequently Asked Questions
Who invented emoji?
Shigetaka Kurita designed the first 176 emoji for NTT DoCoMo in 1999 on a 12x12 pixel grid. The original set is now in the Museum of Modern Art collection in New York City.
Why do emoji look different on different devices?
Unicode assigns each emoji a code point, but the visual design is left to each platform. Apple, Google, and Microsoft each implement their own emoji artwork for the same code point.
How many emoji exist in 2026?
The Unicode Consortium's emoji set includes over 3,600 characters as of 2026. New emoji are added annually through a public submission and review process.