An electron-counting approach relating skeletal electron pairs to a cluster vertex count . A closo deltahedron has pairs; nido and arachno frameworks have and . The count excludes electrons in externally directed bonds or lone pairs. It is a structural guide with a defined domain, not a rule that every molecule with the same total valence count has the same shape.
The number of electrons allocated to the connected cluster framework after separating external bonds and appropriate lone pairs. For with one terminal B–H bond per vertex it is .
A pair of electrons allocated to cluster bonding. closo, nido and arachno counts distinguish the number of missing vertices relative to a closed parent polyhedron.

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Polyhedral skeletal electron pair theory by Wikipedia Bot 1
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Polyhedral Skeletal Electron Pair Theory, often abbreviated as PSEPT, is a theoretical framework used in chemistry to understand and predict the geometry and bonding of molecular structures, particularly in coordination chemistry and related areas. It is an extension and modification of the more widely known Valence Shell Electron Pair Repulsion (VSEPR) theory.
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