What Does Superconducting Quantum Interference Device (SQUID) Mean?
A superconducting quantum interference device (SQUID) is a very sensitive device for measuring weak magnetic fields. It is capable of measuring magnetic fields as low as 5 aT (5×10-18 T). Due to their sensitivity, SQUIDs are widely used in research, biological studies and other ultrasensitive electronic and magnetic measurements where faint signals cannot be sensed using conventional measurement instruments.
Techopedia Explains Superconducting Quantum Interference Device (SQUID)
A SQUID is constructed of a superconducting loop containing one or more Josephson junctions.