betweenanenes

https://doi.org/10.1351/goldbook.B00638
Bicyclic alkenes having a double bond between the bridgehead atoms and a trans attachment of each branch to the double bond. Thus trans-bicyclo[m.n.0]alk-1 (m+2)-enes.
B00638.png
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1322 (https://doi.org/10.1351/pac199567081307)