In human languages, we have "sounds" (or words) to refer to animals. For example, in English, we denominate a dog using the vocal sound
dɒɡ. So, from the perspective of dogs, if they knew that the sound
dɒɡ refers to them, then they "could deduce" that a human emitting the following collection of sounds is referring to them:
lʊk, ðæt ɪz ə kjuːt dɒg. aɪ ˈwʌndə ˈwɛðər ɪt ɪz lɒst?
Now, what about the reverse? Do scientists know of a particular sound (or maybe a sign, a movement, or related form of communication) used by any animal which signifies "human"? In case the current answer is no, is this ever possible to know? Maybe for animals where studies are more advances, like primates?