If someone or something is known as a particular name, that person or thing is called by that name.

And this is Terry, otherwise known as "Muscleman". 这是特里，又名“大力士”。

He worked for a notorious criminal known as Baby Face.

The building is known as "the Gherkin" because of its shape.

The painting is known as the Vaughn portrait.

The aircraft became known as "the Flying Flapjack".