I was trying to create a multilayered visual/verbal pun.
"Spin" (get it?) is a real physical quantity, quantitatively defined by a vector whose length is defined in the direction of the thumb when the curl of the fingers represents the direction of rotation. The right (get it?)hand is specified by convention to remove ambiguity.
The spin vector can now be subject to the manipulations of vector arithmetic, algebra and calculus. For example, a force (also a vector quantity with magnitude and direction) applied to that vector can create yet another vector, which is the precession vector.
I get the bunny, but what's with the pancakes?