| P | Greek capital letter pi |
|---|---|
| p | Greek lower case letter pi; the ratio of circumference to diameter, 3.1415926536 |
| y | Greek letter psi; wave function |
| S | Greek capital letter sigma; syphilis; summation of series |
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
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