@jschatzman Refering to A), like many other computing languages, the Maple language is case sensitive. Hence pi does not equal Pi.
Pi is the defined constant. pi is a variable. (Another example is the variable "e" and "e" which equals exp(-1).) However, when Maple displays either, it appears as the Greek letter, i.e, it appear the same. (There has been requests to have the defined constant displayed in a different color. However, since I suspect so few people use the variable pi, more folks would be annoyed by the change in color.)
If you use Common Symbols palette, Pi is distinct from the pi character in Greek palette.
For the defined constants, you can go to this webpage: https://www.maplesoft.com/support/help/errors/view.aspx?path=initialconstants