Pi

• Ridge ending


  Termination or ending of short ridge
• Bifurcation


  Forming a Y shape
• Dot ridge


  Shortest of all island
• Island (short ridge)


  Formed by a short or series of short ridges
• Ridge bridge or (cross over)


  Connecting ridge between two ridges
• Hook (spur)


  Where the ridge path divides and one branch comes to an end
• Double bifurcation


  Bifurcation where one of the ridge paths bifurcate
• Trifurcation


  Two bifurcations develop next to the same ridge unique formation
• Opposed bifurcations


  Bifurcations found on both ends of a ridge
• Ridge crossing


  The point where two ridges cross each other forming an “X” formation
• Converging ridge


  Two or more lines forming an angle, a ridge whose closed end is angular and serves as a point of convergence