I am looking for the F18 logo that we are suppose to attach one meter from the clew of the mainsail.

Ive seen various photos but I cant make out what is the text that is in the lines under the F18. Does it say Formulae 18 Catamaran? Is that particular text required?

The class rules call for the F18 logo, but what is the F18 logo? Where can I find this image?