This is a familiar burner style whereby three or the usual four distinct prongs extending upward are designed to hold the chimney in place. While there are countless variations of the prong burner, the style generally incorporates stylized or embossed brass prongs which "grip" the straight sides of the chimney. Basically, the chimney is held on by friction. The chimney style corresponding to this burner style is called a "slip" chimney. It has straight (flat and parallel) sides near the base and can be 'slipped' into or out of the burner.