NRS 52.305: Marks instead of signatures; witnesses.

1. The signature of a party, when required to a written instrument, is equally valid if the party cannot write, if:

(a) The person makes his or her mark;

(b) The name of the person making the mark is written near it; and

(c) The mark is witnessed by a person who writes his or her own name as a witness.

2. In order that a signature by mark may be acknowledged or may serve as the signature to any sworn statement, it must be witnessed by two persons who must subscribe their own names as witnesses thereto.