>>16
I've never heard of it. It's still in use in hospitals systems according to Wikipedia.
s A="String" F i=1:1:$L(A) W $c($S($A($E(A,i))<91:$A($E(A,i))-52#26+65,1:$A($E(A,i))-84#26+97))This looks like a perfectly fine and readable ROT-13 function.