There's 16 astral planes (U+1xxxx to U+10xxxx), of which 3 have characters assigned... * plane 1 is the supplementary multilingual plane * plane 2 is the supp

There's 16 astral planes (U+1xxxx to U+10xxxx), of which 3 have characters assigned... * plane 1 is the supplementary multilingual plane * plane 2 is the supplementary ideographic plane * plane E is the supplement­ary special-purpose plane * planes F and 10 are private-use planes Perhaps you wrote from memory.