Thought-speak

From Seerowpedia

Thought-speak is the way Andalites communicate since they have no mouths. It is a language that almost all species can understand. It is not quite telepathy, as beings using thought-speak communicate through universal mind symbols rather than actual thoughts; however, it is like telepathy in that there is no sound being transmitted or received. There are two different types of thought-speak: open and closed. Open thought-speak is where you broadcast what you're thinking to everyone, while closed thought-speak is where you communicate to one person or a selected few. Many other aliens communicate by thought-speak. The Animorphs can also communicate in thought-speak, but only in morph and not in human form or in human morph.