Stationary waves are called, "stationary" because in it

Stationary waves is called standing waves because

Stationary waves are formed when

In stationary wave

"Stationary waves" are so called because in them

Assertion: Stationary waves are so called because particles are at rest in stationary waves. Reason: They are formed by the superposition of two identical waves travelling in opposite directions.

Assertion: Stationary waves are so called because particles are at rest in stationary waves. Reason: They are formed by the superposition of two identical waves travelling in opposite directions.

Why stationary wave is so called?