A question mark.
Perplexity.
One of a series of regular sinuous curves, bends, loops, turns, or windings in the channel of a river, stream, or other watercourse
One of the turns of a winding, crooked, or involved course.
Synonym of Greek key, a decorative border; fretwork.
A self-avoiding closed curve which intersects a line a number of times.
A tortuous or winding journey.
To wind or turn in a course or passage; to be intricate.
To wind, turn, or twist; to make flexuous.