The "three pointed" oil lamp? Real or fantasy?

[Titus Petronicus Graccus]

I've been watching Rome lately (yeah I know but I like the story and the characters are fun) and I've noticed that in a lot of places they have these "three pointed" oil lamps in brass hanging from iron stands.
Are these real or made-up?
I'm a fairly accomplished Blacksmith (having done several dozen Pila for Legio XX in the US) and was thinking this would be a fun project. But not if it's pure fantasy. If I want fantasy, I'll go back to the SCA...