An unnecessary and erroneous term for oxylium ions,
RO+ (
O04360.png is monooxygen, not 'oxene').
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1354 (https://doi.org/10.1351/pac199567081307)