The term tassel in Freemasonry refers to a decorative element that is often associated with the tessellated border surrounding the tracing board. Historically, this border was called the indented tassel, which was a cord ornamented with tassels that encircled the symbols of the Order marked out on the floor during initiation ceremonies. Over time, the name evolved into tassellated border and eventually tessellated border.
The tassels themselves are typically interpreted as symbols of the four cardinal virtues: temperance, fortitude, prudence, and justice. They also represent the four great orders of devas connected with the elements of earth, water, air, and fire, emphasizing the ethical and spiritual dimensions of Freemasonry.
As noted in the writings of Albert G. Mackey, the tessellated border symbolizes the bond of love that unites Freemasons into one band of brotherhood, reflecting the mystic ties that bind the Craft together.