GPHSs of this, or very similar, design were used in the GPHS-RTGs of Cassini-Huygens, New Horizons, the Galileo probe, and the Ulysses probe.
Note that the GPHS are cuboid although they contain cylindrical plutonium based pellets.
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GPHS-RTG or General Purpose Heat Source — Radioisotope Thermoelectric Generator, is a specific design of the Radioisotope Thermoelectric Generator (RTG) used on US space missions.
Subsequent US spacecraft used the GPHS-RTG which used similar SiGe thermoelectic devices but a different packaging of the fuel.
Griggsville-Perry High School, or GPHS, is a public four-year high school located at 202 North Stanford Street in Griggsville, Illinois, a small city in Pike County, Illinois, in the Midwestern United States.