In geometry, it's conventional to use Greek letters for angles. If you have two angles, theta/phi or alpha/beta are reasonable names for them. Probably better t

In geometry, it's conventional to use Greek letters for angles. If you have two angles, theta/phi or alpha/beta are reasonable names for them. Probably better than angle1/angle2 (in which the names are mostly "noise"), but if the angles play specific roles then it may be better to use informative names: azimuth/altitude or whatever. In finance, there are lots of traditional Greek-letter names. Using gamma/delta/theta is probably _more_ immediately comprehensible to your audience than, say, secondOrderUnderlyingSensitivity/underlyingSensitivity/timeDerivative. (Of course, in this case you don't get to choose which Greek letters you use.) There are other contexts where particular Greek-letter names are traditional. Again, usually you don't get to choose which ones you use (at least, not if you want to get any familiarity advantage from using them). When doing algebraic manipulations, sometimes it's convenient to give one set of variables Latin-letter names and another "parallel" set corresponding Greek-letter names. E.g., if you're doing plane geometry, maybe one point is (x,y) and another is (xi,eta). In software, this is probably a strictly worse strategy than calling them (x1,y1) and (x2,y2) or something of the sort.