Terms of orientation, terms of location, or spatial words are common linguistic descriptors used to indicate the spatial positioning of objects in three-dimensional space, including notions of top, bottom, front, back, left side, and right side as used in everyday language and interactions. Assigning these to objects then allows things to be described in relation to the object, above, below, in front of, behind, beside, and so forth.
A ping pong ball is a typical example of an object that has no set top, bottom, front, back, or sides.
Pebbles found on the beach have irregular shapes, but no set top, bottom, front, back, or sides.
Sugar cubes also have no set top, bottom, front, back, or sides; they may be provisionally assigned these characteristics.
Cones of the Korean fir have a clearly discernible top and bottom, but are not clearly differentiated along other dimensions.
Port and starboard are nautical terms for watercraft, aircraft and spacecraft, referring respectively to the left and right sides of the vessel, when aboard and facing the bow (front).
Image from the Bayeux Tapestry showing a longship with a steering oar on the starboard side.
Image: Aft (PSF)