Help finding HiRes images

[Vesuveus]

I'm working on a project involving the images of Variable Frags, Red Frags and Function Subroutines from the game, shown here. ex. The problem is that at 22x22 these images are too small to use as is.

So I am on the hunt for the same symbols used for these images in a higher resolution. I have searched kanji, mandarin and katakana, but cannot find anything that is close to these symbols. For me, it is like finding a needle in a haystack.

Does anyone have information about the symbols used for the code frags that will help narrow my search? Any help is appreciated.