nonclassical carbocation

https://doi.org/10.1351/goldbook.N04185
A @C00817@ the @G02704@ of which has delocalized (bridged) bonding π- or σ-electrons. (N.B. Allylic and benzylic carbocations are not considered nonclassical.)
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1145 [Terms] [Paper]