What does PSO stand for?

PSO stands for "Postman's Sub Office"

How to abbreviate "Postman's Sub Office"?

"Postman's Sub Office" can be abbreviated as PSO

What is the meaning of PSO abbreviation?

The meaning of PSO abbreviation is "Postman's Sub Office"

What does PSO mean?

PSO as abbreviation means "Postman's Sub Office"