Glossary

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N
N
NAK
NAR
NBH
NCA
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Net
NID
NII
NIL
NIU
NM
NP
NRZ
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NTI
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NXX
Null
  • A dummy letter, letter symbol, or code group inserted in an encrypted message to delay or prevent its solution, or to complete encrypted groups for transmission or transmission security purposes.
  • See node (def. #4).
  • Of an antenna radiation pattern, a specific direction in which the radiated power of a transmitting antenna (or response sensitivity of a receiving antenna) approaches zero in relation to the radiated power in the main beam (or desired direction).
  • Note: Often the null has a narrow directivity (angle) compared to that of the main beam, and this can be used for desirable purposes such as radio navigation or prevention of interfering signals in a given direction.