multiple arc
/ˌmʌltɪpl ˈɑːk/noun
1 Mathematics and Surveying. An arc that subtends an angle equal to an integral multiple of the angle subtended by a given arc.
2 Mathematics. Each of two or more lines of a graph that join the same two vertices.
Origin
Early 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From multiple + arc.