The truth is that this issue has been interesting and I think it became clear that meaning is "P".
Best regards Antonio Alcaraz.

600 hits just because of the "P" sign, lol!

I think you are giving a lot of laps, the winch point is only possible space for a rescue from the air as so provided by international standards of rescue.

I'm inclined towards Craigs explanation....the most logical.
An area free of overhead obstructions....makes more sense than clambering down all those containers, only to climb back up to the bridge!

@Kyle: I think the pointy end & the bow wave would be sufficient evidence of that.
I'd go for Graigs suggestion.

The P stands for Port, as in the port bridge wing. the starboard side has an S. its to help aircraft judge the direction a ship is facing if needed. correct?

I work at a port where the helicopter lands on the hatch but talking to some masters they say in Canadian ports the pilot is winched directly to the bridge wing. I imagine that is what this P stands for, I may be wrong tho.
Rgds

Now thus indicated.

I thought "H" & "Only Winch" are for helicopter.

This is the point winch to be rescued by helicopter.

What does that "P" or "d" mean?