gamma rays
High-energy electromagnetic radiation from radioactive decay or nuclear reactions. Used in physics, medicine, and astronomy.
Gamma rays have very strong penetrating power.
In medical settings, gamma rays are sometimes used for sterilization.
Scientific notation using the Greek letter gamma.
From English 'gamma ray' + 線 (ray/beam). The term 'gamma' was adopted from the third letter of the Greek alphabet, used by Ernest Rutherford to name the third type of radiation discovered after alpha and beta rays.