I am not sure exactly how to classify these geometrical ornaments. They resemble the arabesque ornamentation of medieval Islamic art, but also have similarities to Celtic knots and to some Chinese and Korean ornamentation. The bolder of the two only works well at very large point sizes, while the thinner is designed for use at smaller point sizes. There are usually similar ornaments on the same characters of the two, but not always.
available in all of the styles: