unusual navel
Unusual navel describes characters with a navel that is something other than the standard umbilical scar. This is most often seen on robots, living inflatable, or animate inanimate characters, with the navel represented by things like a screw, bolt, USB port, nozzle, or valve.
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The following tags are aliased to this tag: exotic_navel (learn more).
This tag implicates navel (learn more).