How to sign: any spatial attributes (especially as defined by outline)
"he could barely make out their shapes through the smoke";
Similiar / Same: shape, configuration, conformation, form
Categories: spatiality, spatial property
Within this category: angularity, concavity, convexity, crookedness, curvature, dullness, lobularity, narrowing, roundness, sharpness, straightness, stratification, topography
How to sign: a line drawn on a map connecting points of equal height
Similiar / Same: contour line
Categories: isometric, isometric line
Within this category: thalweg