The shape reminds me of characters like U+3244 ㉄ in the Enclosed CJK Letters and Months block.

Maybe another block for enclosed CJK forms is needed.

I suggest other method on encoding this character in my feedback on IRGN2492.

Please do not encode this as a CJK Unified Ideograph, because it looks more like a symbol.

It is impossible to evaluate this character without seeing the full evidence, so here it is:

Based on the full evidence, SAT-05240 is the original Wu Zetian character for 月 which was later changed to 𠥱. Therefore SAT-05240 should be considered to be an ideograph not a symbol, and there is as much reason to encode it as a CJK unified ideograph as U+20971 𠥱.

The evidence given is a footnote, it would be best to confirm the character by evidence from other sources since this is such an usual character. Other sources that talk about the original Wu Zetian character for 月 have a middle component much closer in shape to 出 than to 𣱵.