Salts or charge-transfer complexes of picric acid (2,4,6-trinitrophenol).
See: styphnates
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1359 (https://doi.org/10.1351/pac199567081307)