Here is a link that might work.
Notary Tip: How To Handle A Signature By Mark | NNAstrong text
In Florida - per F.S. 117(14)(b)
"(14) A notary public must make reasonable accommodations to provide notarial services to persons with disabilities.
(b) A notary public may notarize the signature of a person who signs with a mark if:
His (or Her) Mark
STATE OF FLORIDA
COUNTY OF
Sworn to and subscribed before me this day of , (year) , by (name of person making statement) , who signed with a mark in the presence of these witnesses:
(Signature of Notary Public - State of Florida)
(Print, Type, or Stamp Commissioned Name of Notary Public)
Personally Known OR Produced Identification
Type of Identification Produced "
In the event the disability is blindness, the notary is required to read the entire document to the signer prior to signing and notarizing