There isn't really another widely recognized name for the ionosphere. However, you might see it referred to as:

* The thermosphere - The ionosphere is a region within the thermosphere.

* The upper atmosphere - This is a broader term, but it encompasses the ionosphere.

* The radio reflecting layer - This is a more specific term highlighting its role in radio communication.

It's important to note that "ionosphere" is the most common and accepted name for this layer of the Earth's atmosphere.