External Path Length -- from Wolfram MathWorld

The sum over all external (square) nodes of the lengths of the paths from the root of an extended binary tree to each node. For example, in the tree above, the external path length is 25 (Knuth 1997, pp. 399-400). The internal and external path lengths are related by E=I+2n, where n is the number of internal nodes.

Path Integral -- from Wolfram MathWorld

Find Arc Length Calculations for Calculus with Wolfram, Alpha—Wolfram

Graph Path -- from Wolfram MathWorld

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Generalized Petersen Graph -- from Wolfram MathWorld

Pathwidth -- from Wolfram MathWorld

Heap (data structure) - Wikipedia

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Path -- from Wolfram MathWorld

Graph Path -- from Wolfram MathWorld

Equal Parallelians Point -- from Wolfram MathWorld