"eal" might be the name of a register inside the CPU. I remember when I had a book about MS-DOS which had a chapter trying to teach the reader how to write small programs with the DEBUG utility. I discovered there that the CPU's registers were named ax, bx, cx, dx etc. That was back in the late 1980s and 1990s when computers weren't too powerful.
Some time later, with 32-bit CPU's and stuff, the registers were renamed eax, ebx, ecx, edx etc. Well, the "eal" in this case might represent the low bytes(?) of the eax register, while "eah" are the high bytes.
Maybe JS reserve a few other word fragments which make it related to assembly language or the C programming language.
I'm sorry, I don't intend to offend the computer engineers and other people who are far more technologically advanced than I am.