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The Upside down T symbol indicates perpendicular lines.
It is the symbol for 'perpendicular'.
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".
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).
In sets it means intersects. like what is common in both sets