Imperative for 3rd person!? What does "olsun" mean?

Turkish is a crazy language with crazy grammar logic. In Turkish, it is possible to command/order a person that is not even next to you.

In English, the best translation of this rule would be "Tell him/her to do that" meanwhile in Turkish, you could basically say that with the suffix "sIn".

(Sen) Buraya gel!

(O) Buraya gelsin!