100mm / (4") wide x 14mm (5.5") tall
Levi himself described the meaning of the symbol thusly in Dogme et Rituel:
This patch has a black overlocked border and black fabric backing to prevent stitches catching. Our patches can be sewn, pinned or glued to many different mediums, but we recommend testing any glue before washing. Patches are safe for machine washing and warm iron but please do not bleach.