The kanji 秘 ('secret') in a red circle. It means secret or confidential.
People use ㊙️ to mark a secret, a surprise plan or something 'just between us'. It has a playful, top-secret stamp feel. In Japan the circled character appears on documents marked confidential.
Facts
Japanese “secret” button ㊙️ is an emoji in the symbols category, under alphanum. It is one of the early emoji from Japanese phones, standardized in Unicode 6.0 (2010). On GitHub, Slack and other apps you can type it as :secret: or :japanese_secret_button:. People also look for it with words like “Japanese”, “button”, “ideograph”, or “secret”.
Timeline
2010Added to the emoji standard (Unicode 6.0)
Design history
Google (Noto)
2015
2017
2021
2025
Twemoji (X, Discord)
2014
Google Noto Emoji images: Apache 2.0. Twemoji graphics by X Corp and contributors: CC-BY 4.0.