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PN
++/-- Pseudo Noise
+/--- pneumatic
+/--- Part number
AcroLexic: Dictionary of Acronyms and Abbreviations contains 40 more definitions of “PN”.
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See also

Acronym Definitions
PNP 16
PNA 15
APN 11
PNS 10
PPN 9
PNC 8
PNR 8
MPN 7
PND 7
PNET 6
PNL 6
SPN 6
OPN 6
DPN 5
IPN 5
CPN 5
PNB 5
PNE 5
RPN 5
NPN 4