You Do Need power plug adapter while traveling from Nauru to Jordan.

Here is Why You Need An Adapter

The outlet and plug type used in Jordan are C, D, F, G and J and in Nauru is I. This is how they look like.

Nauru

In Nauru, outlets of type I are in use.

Type I

Jordan

In Jordan, outlets of type C, D, F, G and J are in use.

Type C

Type D

Type F

Type G

Type J