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;No factor: Not a threat.
;No joy: Aircrew does not have visual contact with the target, bandit or landmark; opposite of '''''Tally'''''.
;Notch: All-aspect missile defensive maneuver to place threat radar/missile on the beam (directly perpendicular). Modern pulse-doppler radars remove ground clutter by filtering out returns from stationary objects; putting the threat on the beam permits the defending aircraft to be confused with ground returns and hence disappear from the threat radar. As missiles guide by creating a direct intercept course, this is also used to reduce the missile's speed and thus its ability to maneuver if radar lock is maintained. Can also be used in the context of submarine warfare as a maneuverer to leave the sonar detection cone of an incoming torpedo before it closes the distance required to detect and lock onto the notching vessel.
===O===
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