It would be silly to call these things telepathy because by themselves they don’t facilitate a way to communicate thoughts between two minds

A lot of animals use pheromones to communicate details about themselves in a far more complex way than we could by smelling.

and unless these two mechanisms are used to communicate ideas between users.

I think some of the peacock spiders, despite being already visually stunning, actually have UV light reflective surfaces (as well as the abililty to see UV) and use those in their mating display. So even while not being able to generate UV light they still use it to communicate in a way that we couldn’t percieve. It might be a bit of a stretch, but in general you could communicate by manipulating/reflecting natural radio background waves, just as many animals do it with visible (or invisible) light.