Surface contour (fiber)

Okay kiddo, have you ever seen a guitar? You know how the strings on the guitar are kind of curved and raised up? That's called the surface contour.

Now imagine that instead of guitar strings, you have tiny fibers all bunched up together. These fibers can also have curves and bumps on their surface.

The surface contour of a fiber is kind of like a fingerprint - it's unique to each fiber and can help identify it. Scientists can look at the surface contour of a fiber under a microscope to see what kind of fiber it is.

So basically, surface contour is just the way the surface of something (like a guitar string or a fiber) looks, with its curves and bumps and all that jazz.