public address system
P.A. system
PA system
P.A.
PA

I'm not sure the same can be said for the city and the public school system.

We look forward to our work together in building a strong public health system.

Atlanta's public school system has about 100 schools and 48,000 students.

The public school system has a $14.5 billion budget in 2008-2009.

It is the only public school systems in the county.

However, he said his goal was not to end the American public school system.

The great majority of Americans still use the public school system.

Their health systems, public and private, are among the best in the region.

The first public water system was developed in the 1950s.

There was a public address system, as in high school.