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Could be Pulse Repetition Frequency
Actually it is a bit more mundane, it is PReFerred, as in the Preferred number. It replaces an entire list of previous prefix's to military numbers such as C for Connector, R for Resistor, W for Wire, etc.
An example:
MIL-PRF-27/356C succeeds MIL-T-27/356B and is the specification for:
Transformers AND INDUCTORS (AUDIO, POWER AND HIGH-POWER PULSE), INDUCTORS, POWER, TF5S04ZZ
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