FWHM (Full Width at Half Maximum)

https://doi.org/10.1351/goldbook.F02565
See:
half-width
,
line width
Sources:
Green Book, 2nd ed., p. 31 [Terms] [Book]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2244 [Terms] [Paper]
See also:
Orange Book, 2nd ed., p. 226 [Terms]