decibel

https://doi.org/10.1351/goldbook.D01546
Non-SI unit for expressing power levels, \(\mathrm{dB}=0.1151293\ \mathrm{Np}\).
Source:
Green Book,2nd ed., p. 79 (https://www.cintegrado.com.br/site/documentos/green_book_2ed.pdf)