a.k.a

= also known as，意思是‘也就是大家所知的’

Our math teacher, a.k.a. “Darth Vader,” is very serious and strict.
我们的数学老师非常严肃和严厉，又被称为 ‘达斯维达’。

（注：达斯维达是电影星际大战中的大反派黑武士的名字）