What does the term ‘Biomagnetism’ mean

The modern term “biomagnetism” refers to a branch of biology which studies the phenomenon of magnetic fields produced by living organisms and the sensitivity and reaction of living organisms to the earth’s magnetic field and artificial magnetic fields. Biomagnetism arises from electrical currents such as ionic currents generated by brain or heart activity and from magnetic materials such as iron compounds in the liver.
https://bmesolution.com/2022/01/19/history-of-biomagnetism/