What is the label on vertical axis of pictograph representing numbers people speaking different languages?

The label on the vertical axis of a pictograph representing the number of people speaking different languages would likely be:

Number of People or Population

This axis would show the quantity of people who speak each language, represented by the pictograph symbols.

You could also have a more specific label depending on the context:

* Number of Speakers

* Number of Native Speakers

* Number of Fluent Speakers

The specific label will depend on what data is being represented in the pictograph.