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A wavy line saying how long a trill continues.
Also known as: Wavy trill line, Trill continuation
A wavy line after a trill sign says the trill continues for as long as the line runs. Without it a trill's duration is the written note's, which is why a tied note under a trill needs the line to be unambiguous.
A horizontal line of repeated small waves running to the right from a pair of letters above the staff.
The sign starts the trill; the line says how far it runs.