1. Symbol for peta-; phosphorus; phosphate'>phosphate; phosphate'>phosphate; proline; product; poise; power; frequently with subscripts indicating location and/or chemical species.
2. Followed by a subscript, refers to the plasma concentration of the substance indicated by the subscript; permeability constant.
3. A blood group designation. See P blood group, Blood Groups Appendix.
4. Symbol for probability; when followed by the sign for “less than” (<), this indicates that a test statistic, a chi-square (χ2) test, gives a result unlikely to occur by chance.

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