supplementary plane
one of the 16 Unicode planes other than the Basic Multilingual Plane
Supplementary Multilingual Plane
Unicode plane (U+10000-1FFFF)
Tertiary Ideographic Plane
Unicode plane (U+30000-3FFFF)
reserved plane
supplementary Unicode plane reserved for future allocations
Supplementary Special-purpose Plane
Unicode plane (U+E0000-EFFFF)
Supplementary Ideographic Plane
Unicode plane (U+20000-2FFFF)