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The assumption of the use of a two-beamed cross does not determine the number of nails used in the crucifixion and some theories suggest three nails while others suggest four nails. However, throughout history larger numbers of nails have been hypothesized, at times as high as 14 nails. These variations are also present in the artistic depictions of the crucifixion. In the Western Church, before the Renaissance usually four nails would be depicted, with the feet side by side. After the Renaissance most depictions use three nails, with one foot placed on the other. Nails are almost always depicted in art, although Romans sometimes just tied the victims to the cross. The tradition also carries to Christian emblems, e.g. the Jesuits use three nails under the IHS monogram and a cross to symbolize the crucifixion.

How many nails were suggested they used for the crucifixion?
three nails