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Re:Abe explains choice of Reiwa for next era name by fenomas on Sunday March 31, 2019 @11:45PM (#19540311)
The new name just uses standard characters, but what you're probably referring to is the fact that Unicode 12.1 will have a character for the two of them compressed into one glyph.

Details: http://blog.unicode.org/2018/09/new-japanese-era.html

Compressed glyphs like that are sometimes used on paperwork and whatnot, but everyday usage just uses the standard characters.

Re:Abe explains choice of Reiwa for next era name by mappu on Monday April 01, 2019 @01:20AM (#19540702)
What are the benefits of this approach compared to a ligature at the font-level?
Re:Abe explains choice of Reiwa for next era name by masklinn on Monday April 01, 2019 @02:29AM (#19540997)
The square / single-glyph version is only used in some / limited contexts, in most contexts (including the emperor's eventual posthumous name) heisei would be written and displayed "normally".
Re:Abe explains choice of Reiwa for next era name by fenomas on Monday April 01, 2019 @02:06AM (#19540913)
I'm not competent to answer that, but the "merged glyph" versions of the other four modern era names date from older encodings like EUC and shift-JIS, and are presumably in unicode for compatibility. So the rationale for adding a new one may just be extending that set.