A.2 Glossary of Specialized Terms 341 not be considered as “sensory” (on the other hand, speech audio data would be considered as "sensory”). e Short Term Importance: A value associated with each Atom, indicating roughly the expected utility to the system of keeping that Atom in RAM rather than saving it to disk or deleting it. It’s possible to have multple LTI values pertaining to different time scales, but so far practical implementation and most theory has centered on the option of a single LTI value. e Similarity: a link type indicating the probabilistic similarity between two different Atoms. Generically this is a combination of Intensional Similarity (similarity of properties) and Extensional Similarity (similarity of members). e Simple Truth Value: a TruthValue involving a pair (s,d) indicating strength (e.g. proba- bility or fuzzy set membership) and confidence d. d may be replaced by other options such as a count n or a weight of evidence w. e Simulation World: See Internal Simulation World e SMEPH (Self-Modifying Evolving Probabilistic Hypergraphs): a style of modeling systems, in which each system is associated with a derived hypergraph e SMEPH Edge: A link in a SMEPH derived hypergraph, indicating an empirically observed relationship (e.g. inheritance or similarity) between two e SMEPH Vertex: A node in a SMEPH derived hypergraph representing a system, indicat- ing a collection of system states empirically observed to arise in conjunction with the same external stimuli e Spatial Inference: PLN reasoning including Atoms that explicitly reference spatial rela- tionships e Spatiotemporal Inference: PLN reasoning including Atoms that explicitly reference spa- tial and temporal relationships e STI: Shorthand for Short Term Importance e Strength: The main component of a TruthValue object, lying in the interval [0,1], refer- ring either to a probability (in cases like InheritanceLink, SimilarityLink, EquivalenceLink, ImplicationLink, etc.) or a fuzzy