Frequencies from 216 to 450 MHz were sometimes called P-band: Previous, since early BritishRadar used this band but later switched to higher frequencies.
L band
1 to 2 GHz
Long wave
S band
2 to 4 GHz
Short wave
C band
4 to 8 GHz
Compromise between S and X
X band
8 to 12 GHz
Used in WW II for fire control, X for cross (as in crosshair)
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