An a'dam
This refers to the presence of sul'dam or damane in the chapter.
TGH, Ch. 40, Ch. 43
LoC, Ch. 8, Ch. 37
TPoD, Ch. 22
WH, Ch. 9, Ch. 20, Ch. 22
CoT, Ch. 3
KoD, Ch. 7
ToM, Ch. 47