User blog:SandstoneGem/Sandstone's second notation

x|y - means x^10^y! where x and y are numbers

[x] - means x^10^x^10

{x} - means [x] * [x]

L - means LOWER LAYER - [x[x[x[x[x[x]x]x]x]x]x]

M - means MEDIUM LAYER - L! * {x{x{x}x}x}

H - means HIGHTER LAYER - M! ^ M!

S - means HIGHTEST LAYER - (((H!)!)!)!