Unravel means to come undone. If a piece of yarn comes apart, it has unraveled.
Seperating
It is known as the hem. A hem is a stitched narrow fold of cloth that prevents unravelling of a raw edge.
Maths, Science, History unravelling the mystery. It all started with a big bang.
Marianne Warren has written: 'Unravelling the enigma' -- subject(s): Sufism, Biography, Hindus
Ann Rhiannon Evans has written: 'The unravelling of a fragile and brittle roll of wallpaper and its conservation'
Foekje Boersma has written: 'Unravelling textiles' -- subject(s): Textile fabrics, Conservation and restoration
The stuff can be metal or plastic, but the word for the thing itself is an aglet - that little piece which stops the laces from unravelling.
One can keep sweaters from unraveling by reducing the size. There are several methods in which one can do so . Some of which include folding and stitching the edge.
A type of knot use to make a loop at the end of a rope. Made by unravelling the end of twisted multicord rope and plaiting the unraveld ends back into the rope.
If you mean is there a danger of belly button (navels) unravelling then no. If you mean is there a phobia name for it then probably. The name of a fear of belly buttons is omphalophobia. I have this phobia, but I don't know anybody else with it.
The aglet is the piece at the end of the shoelace that keeps it from unravelling and makes it easier to lace. The metal rings that the lace goes through are grommets.
The small plastic or metal sheath on the end of shoelaces, which keeps the twine from unravelling plus makes it easier to feed the lace through the eyelets, is called an aglet (or aiglet).