Yes, dolphins use signature whistles to represent other dolphins, in a similar way that humans use names. These signature whistles are unique to each dolphin and are used to identify individuals within a group. Signature whistles are learned by dolphins as calves from their mothers and are retained throughout their lives. They are typically short, high-pitched sounds that can be heard over long distances in the water.

Dolphins use signature whistles in a variety of social contexts, such as greeting each other, forming alliances, and coordinating group activities. By using signature whistles, dolphins are able to maintain social relationships, recognize individuals, and cooperate with each other effectively. The use of signature whistles is a form of acoustic communication that is characteristic of dolphin societies and demonstrates their remarkable social intelligence.