Assertion: principal moment | /r/HasProperty | the same
Facets:
Source sentences:
text: If two principal moments are the same, the rigid body is called a symmetrical top and there is no unique choice for the two corresponding principal axes.
text: If all three principal moments are the same, the rigid body is called a spherical top (although it need not be spherical) and any axis can be considered a principal axis, meaning that the moment of inertia is the same about any axis.