Answer: Longitudinal wave
Explanation: waves can be categorized on the basis of direction of movement of the individual particle of the medium relative to the direction of the wave it travels. Now, on the same basis we will categorize longitudinal and transverse wave.
Now the question asked about the longitudinal wave so, we can answer through the following definition. stationary waves are the waves which remain stationary with respect to time and distance.
longitudinal waves are the waves in which the vibration of the medium is parallel to the direction the wave travels and displacement of the medium is in the same direction of the wave propagation.