An elevation is different. It shows the face of something, or perhaps more correct, the projection of an object/s to a plane. But my testing suggests it produces SECTIONS, not elevations.
Yes, you can use abbreviations in tables and figures. All abbreviations used in tables and figures should be defined in the table note or figure caption, respectively, even though the abbreviations will be also be defined in the text if they are used there.
Most of these abbreviations are mnemonic (S for subject, P pronoun, V verb, O object). A few, of necessity, are arbitrary (Q for qualifier, but G for a qualifier placed after the word it qualifies). Abbreviations. A. Assertion; noun predicate. The noun is simply stated, without any verb of existence or identity.