BT Er 13a(32) :תאגא דדלת‏ : the protruding part of the daleth
See the entire entry for dlt n.f. <i>daleth</i>, <i>dolath</i>, fourth letter

BT Er 13a(32) :תאגא דדלת‏ : the crownlet of the daleth
See the entire entry for tāḡ, tāḡā n.m. crown