Parabola
A simple curve shaped like an arch
You can remember what a parabola is by remembering this old parable:

There is an old parable (parabola) that says, what goes up must come down.
The following are all examples of parabolas:
Example 1

Example 2

Example 3

Example 4

Water fountains can make parabolas.
Example 5

Bananas are shaped like parabolas.
Example 6

Dolphins jump in a parabola shape.