sa'o VUhU4 cmavo

trinary mathematical operator: [derivative of a with respect to b of degree c].

On affix form:

x1 is sloped/inclined/slanted/aslant with angle x2 to horizon/frame x3.

In notes:

x1 is the derivative of x2 with respect to x3.
mekso binary operator: del, nabla, quabla, partial-derivative vector/tensor operator; outputs the functional-valued formal-covector (or analog thereof) of partial derivatives with respect to X1 (tensor in the same format and order), each degree X2 (default: 1).