Radical 213 meaning "turtle" is one of only two of the 214 Kangxi radicals that are composed of 16 strokes.

In the Kangxi Dictionary there are only 24 characters (out of 40,000) to be found under this radical.

In Taoist cosmology, 龜 (Polyhedron) is the nature component of the Ba gua diagram 坎 Kǎn.

There are a number of variant characters that appear different but mean the same thing: As a CJK Unified Ideograph, U+9F9C 龜 CJK UNIFIED IDEOGRAPH-9F9C has seven separate reference glyphs shown in the Unicode code charts, no two of which are exactly identical:[1] As such, appearance may subtly vary between fonts intended for different regions: Due to an especially large number of variant forms associated with Radical 213, an exceptionally large number of Unicode characters exist displaying variants of the character itself, as opposed to derived characters.

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