So it would seem. It was Tombstone II (Roman numeral for "two.") Tombstone is a city/town in Arizona as well as being the name for a headstone/grave marker. We don't know yet what it means on Prison Break, likely the name of some secret "The Company" operation.
Also a brand of pizza. Which is unlikely to be relevant to Prison Break but you never know. BTW, Tombstone, AZ is famous in Old West lore, especially for the shootout at O.K. Corral. Which does sound like the kind of thing likely to be relevant to Prison Break. The gunfight also involved three sets of brothers (the Earps, the Clantons and the McLaury's) also in keeping with the Linc-Michael theme.