angle strain

https://doi.org/10.1351/goldbook.A00349
Strain
due to a departure in bond
angle
from 'normal' values. The term is often used in the context of non-aromatic cyclic compounds in which the internal angles differ from the regular tetrahedral
angle
of 10928; in this sense
angle
strain
is also known as
Baeyer strain
.
Source:
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2198 [Terms] [Paper]