Whats in a bunker?

[Marcello]

"Marcello do you use the dug in tank turrents and if you do how good are they?"

It depends about what we are speaking about both in real life and in game terms.
Normal tanks dug in in the earth for a prepared defense?
Older tanks stripped of their engines, dug in concrete lined revetments and used as bunkers?
Tank turrets mounted on purpose built bunkers?
What are you referring to here?

In game terms "entrenched tank" or "bunker"?