Signal
varying physical quantity that conveys information
BLC1
riding aids
image
Event-related potential
A20 line
safeword
test card
noise
dial tone
analog signal
digital signal
discrete signal
continuous signal
time signal
S band
Ringing
self-clocking signal
Chirp
Chirp
Letter beacon
Wow! signal
chrominance
luma
energy
audio signal
N2pc
power good signal
safeword
stop signal
video signal
Mark and space