Cations

Pyramidal carbocation

A pyramidal carbocation is a type of carbocation with a specific configuration. This ion exists as a third class, besides the classical and non-classical ions. In these ions, a single carbon atom hovers over a four- or five-sided polygon, in effect forming a pyramid. The four-sided pyramidal ion will carry a charge of 1+, and the five-sided pyramid will carry 2+. In the images (at upper right), the black spot on the vertical line represents the hovering carbon atom. The apparent coordination number of five, or even six, associated with the carbon atom at the top of the pyramid is a rarity as compared to the usual maximum of four. (Wikipedia).

Pyramidal carbocation
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Hydride | Deuterium | Carbocation | Linear combination of atomic orbitals | Polygon | Apex (geometry) | HΓΌckel method | Arenium ion