S: (n) invariant#1 (invariant%1:09:00::) (a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it)
S: (n) side#6 (side%1:09:00::) (an aspect of something (as contrasted with some other implied aspect)) "he was on the heavy side"; "he is on the purchasing side of the business"; "it brought out his better side"
S: (n) surface#4 (surface%1:09:00::) (a superficial aspect as opposed to the real nature of something) "it was not what it appeared to be on the surface"
S: (n) badge#2 (badge%1:09:00::) (any feature that is regarded as a sign of status (a particular power or quality or rank)) "wearing a tie was regarded as a badge of respectability"
S: (n) contour#3 (contour%1:09:00::) (a feature (or the order or arrangement of features) of anything having a complex structure) "the contours of the melody"; "it defines a major contour of this administration"