The mark consists of A stylized number one with a traced outline with the interior the 1 a transparency. The top half of the one is interlaced by a stylized solid number 3 with the 1 running through the center of the 3 under the bottom bar of the three and then over the top bar of the 3. At the bottom, a second number 3 is offset to the left, with its top bar running in front of the higher 3 and interlaced through the number 1, the bottom bar of the top number 3 forms the middle bar of the lower number three, and the outlined number one is superimposed over the bottom bar of the lower number three.
THREE ONE THREE; THREE HUNDRED THIRTEEN; THREE THIRTEEN
Color is not claimed as a feature of the mark.