Nabla symbol topic
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Nabla is the symbol (∇). The name comes from the Greek word for a Hebrew harp, which had a similar shape. Related words also exist in Aramaic and Hebrew. The symbol was first used by William Rowan Hamilton in the form of a sideways wedge: ⊳. Another, less-common name for the symbol is atled (delta spelled backwards), because the nabla is an inverted Greek letter delta. In actual Greek usage, the symbol is called ανάδελτα, anádelta, which means "upside-down delta".
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