I understand one or two had peg legs and eye patches. The expression "aaarrrrr!" was frequently heard before each command was given, e.g., "Aaaaarrrr! Give 'em a broard side, mateys." Climbing up the sides of the vessel with daggers between the teeth was another indication. Oh yeah, thar be pirates in them thar waters, matey. Aaaaaarrrrrr!
Bloody Jenny Vane