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In mathematics an upside down triangle corresponds to the gradient operator and is sometimes called "del". The Greek symbol of an upside down triangle is called "Nabla".
at the top. The "base" of a triangle is arbitrary.
Upside down triangle bro ;)
The 'upside down' triangle symbol is the (greek?) letter Nabla. Nabla means the gradient. The gradient is the vector field whoose components are the partial derivatives of a function F given by (df/dx, df/dy).
(the shape is an upside down 'u').