In the 1990's there was a rash of postal worker rage wherein many workers got out of hand to the point of bringing guns to work and shots being fired. As a result the phrases "go postal" or "go postal worker" were coined.

It's "Codigo Postal" and it means Zip Code.

For postal codes of different areas of Chittagong go to the link found in the related links.

postal code for luanshya?

The term "go postal" or "going postal" was coined circa 1994, during a time when workplace violence made the news with several employees of the United States Postal Service became so enraged with their jobs that they actually fired guns in their workplace.

See the Related Link " s.com: Go Postal" for more background information.