The ASCII column are the ASCII codes for the English letters, in Major. ALPHA jail back means that ALPHA has ascii codes ‘A’ = jail = 65, ‘a’ = back = 97, and so on.
Your description of math tricks is exactly correct. It works for many famous derivations of approximate formulas in Physics, too, especially those that need a flash of inight, or genius, or some trick from left field that you’re not going to remember without a technique. I don’t have an example on the top of my memory because I stopped doing integrals by hand 50 years ago But I used to do them for fun with my friends and we would have speed races and I would win often. I remember Graduate Atomic Physics was a brutal course full of hundreds of tricky, dense formulas. omega to the ninth power, empirical fits of curves to Chebyshev polynomials and you need to remember the coefficients. It was easy for me and just killed everyone else. lucky me. I taught a couple of my friends my techniques. I’ve taught them to a lot of children. It takes 20 minutes to teach the first 10 majors to a bright seven-year-old and then you’ve just made him/her a superhero in school!
The Hebrew letters just give me extra visualizations. For example, Papa, 16, tissue, Ayin, face Titan: ok, my Papa is crying through his eyes (Ayin), wiping with a tissue, because he is looking at the beautiful face of Cleopatra (as played by Liz Taylor) on the movie poster in front of the old-fashioned theatre, and the poster is being held by a Titanic robot.