It represents the 12 most frequent letters in typical English language text. Useful for breaking classic ciphers.
Also first two rows of letters on Linotype machine.
Thanks for explaining.
Been a while since I thought of linotype machines.
Does your knowledge ever end :-) so Much Depth. I’m glad you’re on our side.
I’m going to send you a p.m. question. Maybe I’ll include my address for your future travels lol