Umbilical plane
Encyclopedia
The umbilical plane is the transverse plane
Transverse plane
The transverse plane is an imaginary plane that divides the body into superior and inferior parts. It is perpendicular to the coronal and sagittal planes....

 passing through the umbilicus
Navel
The navel is a scar on the abdomen caused when the umbilical cord is removed from a newborn baby...

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This is similar to the location of the mid-transverse plane, which is the transverse plane made through the waist, into roughly two halves: the torso, arms and head on the top, and the pelvis and legs (including hands if arms are held vertically) at the bottom. That is the plane seen in the picture.
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