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O button (blood type)

O button (blood type) Emoji

Symbols

A bold, white letter 'O' encased in a bright red square. This character is modeled after the graphical style of Japanese blood type indicator icons.

Usage Context

While it is primarily used in Japan to denote someone's blood type, the rest of the world typically uses it to represent the letter 'O' or as a stand-in for the word 'Oxygen' in scientific or medical contexts. It is frequently paired with other blood type markers like 🅰, 🅱, or 🆎 to share personal health information or medical IDs.

History

This symbol was officially added to the Unicode standard in 2010 as part of the initial emoji set. It originates from early Japanese mobile messaging services where categorizing blood types—a common personality indicator in Japanese culture—was a standard feature of digital profiles.

Details

Glyph
🅾
Unicode
U+1F17E
Shortcode
:emoji_u1f17e:
HTML Entity
��

Specifications

Vendor Google
Category Symbols
Subcategory alphanum
Unicode Version 6.0
Emoji Version 1.0
License CC-BY 4.0
Tags
bloodbuttonotypeblood typealphabetletter omedicalblood groupred squarealphanum

Google Noto License

Emoji graphics by Twitter/X, licensed under CC-BY 4.0

Noto Color Emoji graphics are copyrighted by Google Inc. and licensed under the Apache License, Version 2.0. Font files may also be subject to the SIL Open Font License, Version 1.1.

Apache 2.0SIL OFL 1.1Noto Repository

Related Symbols Emojis

Digit zero Digit one Digit two Digit three Digit four Digit five Digit six Digit seven Digit eight Digit nine A button (blood type) B button (blood type)