The nabla is a triangular symbol resembling an inverted Greek delta, used to denote the del vector differential operator. Its name comes from the symbol's shape, which resembles an ancient Phoenician harp called a nabla in Hellenistic Greek, a name suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Origin Yearsuggested by William Robertson Smith in an 1870 letter to Peter Guthrie Tait Connections
Is Kind Of Object
Entity-backed identity for the object-kind enum value this mathematical object already carries, resolved to a mathematics concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The object-kind fact itself stays on the object unchanged.
Sources
1. Nabla Symbol (Wikipedia)
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