What does S/N stand for?

What does S/N mean?

S/N	Signal-to-Noise Ratio Computing » Software
S/N	Signal-to-Noise Ratio Computing » Telecom
S/N	Signal-to-Noise Ratio Governmental » Transportation
S/N	Signal-to-Noise Ratio Computing » Networking
S/N	Signal-to-Noise Ratio Governmental » NASA
S/N	Serial Number Academic & Science » Ocean Science
S/N	Serial Number Governmental » NASA
S/N	Serial Number Governmental » US Government
S/N	Serial Number Medical » Veterinary
S/N	Serial Number Computing » General
S/N	Serial Number Academic & Science » Electronics
S/N	Signal-to-Noise Ratio Governmental » Military
S/N	Serial Number Business » General
S/N	Serial Number Governmental » Transportation
S/N	Serial Number Governmental » Military
S/N	Signal to Noise Governmental » Military
s/n	signed and numbered Community

signal-to-noise ratio, signal-to-noise, signal/noise ratio, signal/noise, S/N(noun): the ratio of signal intensity to noise intensity