"Αυτό είναι πάνω."

Translation: This is on top.

[AttilaMoln1]

Why not "this is on THE top"?

[troll1995]

You're right!. Added!

[AttilaMoln1]

thanks :)

[Cheetaiean]

It is on ?

[Treysterok]

How does this mean "This is upstairs"? Wouldn't that be a different word entirely?

[troll1995]

There is no different word for "upstairs" in Greek. Πάνω or πάνω όροφος is what we use to say "upstairs".

[Jagoda312594]

How about "It is on top"? Would that be accepted and, if not, how would I say it to differentiate from "this"?

[mizinamo]

How about "It is on top"? Would that be accepted

Yes.