What is the collective noun for diagrams?

There isn't a widely accepted or commonly used collective noun specifically for diagrams.

However, you can use some general collective nouns depending on the context:

* A set of diagrams

* A collection of diagrams

* A series of diagrams

* A group of diagrams

* An array of diagrams

You could also use more descriptive phrases:

* A schematic representation

* A visual explanation

* A technical illustration

Ultimately, the best choice will depend on the specific context and the type of diagrams you are referring to.