I was trying to read an older paper about treewidth by Halin (1976). He used different hand-written labels, obviously Sütterlin:
I assume the hand-written letters to be (from top to bottom and from left to right) "F*(n)", "C*(n)", "D*(n)". No I am poring over the next letter. Is it an "Y*(n)"? Or a "H*(n)"? Or even a strangely-written "E*(n)"?