| Observable | https://uor.foundation/observable/Observable | http://www.w3.org/2002/07/owl#Thing | | A measurable quantity in the UOR Framework. All observables are kernel-computed and user-consumed. |
| StratumObservable | https://uor.foundation/observable/StratumObservable | https://uor.foundation/observable/Observable | | An observable measuring stratum-level properties: position within the ring's layer structure. |
| MetricObservable | https://uor.foundation/observable/MetricObservable | https://uor.foundation/observable/Observable | | An observable measuring geometric distance between ring elements under a specific metric. |
| PathObservable | https://uor.foundation/observable/PathObservable | https://uor.foundation/observable/Observable | | An observable measuring properties of paths through the ring: path length, total variation, winding number. |
| CascadeObservable | https://uor.foundation/observable/CascadeObservable | https://uor.foundation/observable/Observable | | An observable measuring cascade properties: the length and count of operation sequences. |
| CatastropheObservable | https://uor.foundation/observable/CatastropheObservable | https://uor.foundation/observable/Observable | | An observable measuring catastrophe-theoretic properties: thresholds at which qualitative changes occur in the partition. |
| CurvatureObservable | https://uor.foundation/observable/CurvatureObservable | https://uor.foundation/observable/Observable | | An observable measuring the curvature of the UOR geometry: the gap between ring-isometry and Hamming-isometry for a given transform. |
| HolonomyObservable | https://uor.foundation/observable/HolonomyObservable | https://uor.foundation/observable/Observable | | An observable measuring holonomy: the accumulated transformation when traversing a closed path in the ring. |
| RingMetric | https://uor.foundation/observable/RingMetric | https://uor.foundation/observable/MetricObservable | | Distance between two ring elements under the ring metric: d_R(x, y) = |x - y| mod 2^n. |
| HammingMetric | https://uor.foundation/observable/HammingMetric | https://uor.foundation/observable/MetricObservable | | Distance between two ring elements under the Hamming metric: the number of bit positions where they differ. |
| IncompatibilityMetric | https://uor.foundation/observable/IncompatibilityMetric | https://uor.foundation/observable/MetricObservable | | The metric incompatibility between two ring elements: the divergence between their ring-metric and Hamming-metric distances, measuring geometric curvature. |
| StratumValue | https://uor.foundation/observable/StratumValue | https://uor.foundation/observable/StratumObservable | | The stratum index of a ring element. |
| StratumDelta | https://uor.foundation/observable/StratumDelta | https://uor.foundation/observable/StratumObservable | | The difference in stratum between two ring elements. |
| StratumTrajectory | https://uor.foundation/observable/StratumTrajectory | https://uor.foundation/observable/StratumObservable | | The sequence of strata traversed by a path through the ring. |
| PathLength | https://uor.foundation/observable/PathLength | https://uor.foundation/observable/PathObservable | | The length of a path through the ring, measured in operation steps. |
| TotalVariation | https://uor.foundation/observable/TotalVariation | https://uor.foundation/observable/PathObservable | | The total variation of a path: the sum of metric distances between consecutive elements. |
| WindingNumber | https://uor.foundation/observable/WindingNumber | https://uor.foundation/observable/PathObservable | | The winding number of a closed path: the number of times the path wraps around the ring. |
| CascadeLength | https://uor.foundation/observable/CascadeLength | https://uor.foundation/observable/CascadeObservable | | The number of operation applications in an operation cascade. |
| CascadeCount | https://uor.foundation/observable/CascadeCount | https://uor.foundation/observable/CascadeObservable | | The number of distinct cascades in a computation. |
| CatastropheThreshold | https://uor.foundation/observable/CatastropheThreshold | https://uor.foundation/observable/CatastropheObservable | | A critical value at which a qualitative change occurs in the partition structure. |
| CatastropheCount | https://uor.foundation/observable/CatastropheCount | https://uor.foundation/observable/CatastropheObservable | | The number of catastrophe events (qualitative partition changes) in a computation. |
| Commutator | https://uor.foundation/observable/Commutator | https://uor.foundation/observable/CurvatureObservable | | The commutator [f, g](x) = f(g(x)) - g(f(x)) of two operations, measuring their non-commutativity. |
| CurvatureFlux | https://uor.foundation/observable/CurvatureFlux | https://uor.foundation/observable/CurvatureObservable | | The integrated curvature over a region of type space: the total metric incompatibility accumulated. |
| Monodromy | https://uor.foundation/observable/Monodromy | https://uor.foundation/observable/HolonomyObservable | | The monodromy of a closed path: the net transformation accumulated when traversing a loop in the type space. |
| ParallelTransport | https://uor.foundation/observable/ParallelTransport | https://uor.foundation/observable/HolonomyObservable | | The parallel transport of a vector along a path: the canonical lift of the path to the tangent bundle of the ring. |
| DihedralElement | https://uor.foundation/observable/DihedralElement | https://uor.foundation/observable/HolonomyObservable | | An element of the dihedral group D_{2^n} acting on the type space. Each dihedral element induces an isometry of 𝒯_n. |