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Z
Z 1 Vertical (normal) axis (OZ), or any parameter
measured along that axis or parallel to it, eg normal force
(also called N by some authorities) or structural depth. In
particular, geopotential altitude.
2 Impedance; unit, ohm.
3 Zenith.
4 Section modulus (also called S).
5 Time suffix: GMT = Zulu.
6 US military aircraft designation prefix: obsolete
(pre-1962).
7 US military aircraft modified mission designation
prefix: planning (ie still a project).
8 USN aircraft modified mission suffix: administrative
version (pre-1962).
9 USN aircraft designation prefix: airship (1922–62).
10 Fluid pressure-difference (dP) due to difference in
level (in Earth gravity).
11 Viscosity relative to absolute viscosity of water.
12 Atomic number.
13 Reflectivity factor.
14 Tower.
15 Flight rules governing change visual to IFR.
16 Freezing rain.
17 Prefix zetta, = × 10 21.
18 See Zwilling.
z 1 Normal axis of cartesian figure (ie perpendicular to
plane of paper).
2 Distance measured along normal axis (also Z).
3 Impedence (Z more common).
4 Zone.
5 Ion valency [anion negative].
6 Now often used for aircraft vertical axis instead of Z.
7 Prefix zepto = × 10 -21 .
8 Number of teeth in a gearwheel.
z¯ Co-ordinate position of c.g. measured along OZ
normal axis.
z Vertical (normal) axis relative to direction of travel.
z Vertical (normal) axis relative to Earth or space.
Z-axis See Z (1).
Z-battery Fired unguided anti-aircraft rockets (UK,
WW2).
Z-beacon See Z-marker.
Z-correction Correction for coriolis applied by moving
celestial fix or PL at 90° to track (ASCC).
Z-fibre Process for curing laminates through which are
passed small-diameter pins of pultruded CF or other
material.
Z-harness See Z-type.
Z-Hud, Z-HUD HUD whose main optical power is a
reflector subtending