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.
Abbreviations Abbreviation is the word formation process in which a word or phrase is shortened. Initialisms are a type of abbreviation formed by the initial letters of a word or phrase. Although abbreviation is largely a convention of written language, sometimes abbreviations carry over into spoken language.