What does Japanese “secret” Button look like on Samsung?

On Samsung it is the design shipped in One UI 8.5, shown above at full size. Older revisions are listed beneath it.

When did Samsung add Japanese “secret” Button?

Samsung first drew Japanese “secret” Button in Touchwiz 2.0, released April 26, 2013.

Samsung Electronics has shipped 26 versions of Japanese “secret” Button. Each is dated, so you can see when the design changed.

Samsung One UI 7.0 April 2025

This is the design Samsung introduced in One UI 7.0, shipped again unchanged. It was not redrawn for this release.

✳ marks a release that redrew this emoji. The rest re-shipped the design unchanged.

What does Japanese “secret” Button look like on Samsung?: On Samsung it is the design shipped in One UI 8.5, shown above at full size. Older revisions are listed beneath it.
When did Samsung add Japanese “secret” Button?: Samsung first drew Japanese “secret” Button in Touchwiz 2.0, released April 26, 2013.
How many times has Samsung redrawn Japanese “secret” Button?: Samsung Electronics has shipped 26 versions of Japanese “secret” Button. Each is dated, so you can see when the design changed.