Relay Nomenclature

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Description (Prefix) Apparatus (Last letter)
A Approach; Automatic; Relay Contact - Arm A Axle Counter
B Block; Bolt; Relay Contact - Back B Block Instrument
C Checking or Proving; Coding C Contact
D Clear (green); Decoding; Relay Contact - De-energised D -
E Light; Lamp; Heat (externally applied); Emergency; Earth E Light; Lamp; Earth
F Fog; Flashing; Feed; Relay Contact - Front F Detonator Placers
f Frequency f Fuse
G Signal G Signal apparatus
g - g Lightning Arrestor
H Caution (yellow) H Capacitor
HH Preliminary Caution (double yellow) -
I AWS I Inductor
J Time (delaying action) J Rectifier; Diode
K Indicating or detecting K Indicator electro-mechanical
L Locking; Left L Lock
M Marker; Magnetic M Motor
N Normal N Release; Hand-operated switch; Push-button or key
O Retarding O Resistor; Heater
P Repeating P Lever Latch or Trigger contact
Q Treadle or Bar Q Local coil of a double-element relay; Treadle; Bar
R Reverse; Right; Danger (red) R Relay or contactor
Rx Receiving Rx Receiver
S Stick S -
T Track Circuit T Transformer
Tx Transmitting Tx Transmitter
U Route U Unit
V Trainstop V Trainstop apparatus
W Points W Points operating apparatus
X Audible annunciator; Level crossing; Wrong direction X Audible annunciator (bell, buzzer, horn, etc)
Y Slotting or disengaging Y Slotting or disengaging apparatus
Z Special (to be explained on plan) Z Special unit (to be explained on plan)

Source: http://static.scbist.com/scb/uploaded/331_1354714587.pdf