I vaguely remember some sort of heritage day in grade school at PS 229 in New York City.
He went out into the sunshine, where the air rang with the shouts of the kids of PS 101 in the playground.
1610s, abbreviation of Latin post scriptum (see postscript).
The symbol for parity.
The symbol for phosphorus.
The symbol for power.
The symbol for pressure.
1. PostScript. 2. Physical Sequential.