A single bump or disturbance that travels through a medium is called a wave pulse.

Here's why:

* Wave: A wave is a disturbance that travels through a medium, transferring energy without transferring matter.

* Pulse: A pulse is a single, short burst of energy within a wave.

Examples:

* Dropping a pebble into a still pond creates a wave pulse that travels outwards.

* A flick of a rope creates a wave pulse that travels down the rope.

Let me know if you have any other questions!