inductively-coupled plasma 

Initialism: ICP
https://doi.org/10.1351/goldbook.08488
Plasma produced by induction by means of a high-frequency (about 2500 Hz) electromagnetic field. The region of gas at high temperature and free from the field is taken as the region of observation.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 721 [Terms] [Paper]