http://blog.unicode.org/2018/09/new-japanese-era.html http://blog.unicode.org/2018/09/new-japanese-era.html was posted here yesterday, but the short answer is t

http://blog.unicode.org/2018/09/new-japanese-era.html http://blog.unicode.org/2018/09/new-japanese-era.html was posted here yesterday, but the short answer is that the era can be referred to using two existing characters (for the current era: 平成) or with one new combined one (㍻). Wiki is using the former, so it doesn't need software support.