p.o.

An independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States.

A radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor.

A European river; flows into the Adriatic Sea.

A noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army.