7D

Seven-dimensional space, denoted R^7 in Euclidean geometry, consists of ordered septuples of real numbers. A point is described by seven coordinates. Like lower-dimensional spaces, R^7 supports concepts such as distance, angles, and volumes, but geometric intuition becomes harder as dimensionality grows. The unit 7-ball consists of all points with norm ≤ 1; in general, the volume and surface area of spheres S^{n−1} depend on n and follow standard formulas.

In physics, seven dimensions arise in certain high-energy and string theory frameworks. For example, M-theory compactifications can involve seven-dimensional manifolds with special holonomy, notably G2-manifolds, yielding four-dimensional effective theories with supersymmetry.

Important objects include the seven-sphere S^7, which is the set of points at unit distance from the origin in R^8 and is known for being parallelizable. The topology and geometry of 7-manifolds are active areas of study, including questions about curvature, topological invariants, and possible holonomy groups.

In entertainment and marketing, "7D" is used to describe immersive theater experiences that combine 3D films with additional effects such as motion-enabled seating, wind, scents, fog, or vibration. These attractions are not standardized by a formal definition and vary by venue.