• Dihedral angle
  Dihedral angle
  In geometry, a dihedral or torsion angle is the angle between two planes.The dihedral angle of two planes can be seen by looking at the planes "edge on", i.e., along their line of intersection...
  
  , the angle between two mathematical planes
• Dihedral (aircraft), the upward angle of a fixed-wing aircraft's wings where they meet at the fuselage, dihedral effect of an aircraft, longitudinal dihedral angle of a fixed-wing aircraft
• Dihedral group
  Dihedral group
  In mathematics, a dihedral group is the group of symmetries of a regular polygon, including both rotations and reflections. Dihedral groups are among the simplest examples of finite groups, and they play an important role in group theory, geometry, and chemistry.See also: Dihedral symmetry in three...
  
  , the group of symmetries of the n-sided polygon in abstract algebra
  • Also Dihedral symmetry in three dimensions
    Dihedral symmetry in three dimensions
    This article deals with three infinite sequences of point groups in three dimensions which have a symmetry group that as abstract group is a dihedral group Dihn .See also point groups in two dimensions.Chiral:...
    
    
• Dihedral kite, also known as a bowed kite
  Bowed kite
  Bowed kites such as the Japanese rokkaku, and traditional versions of the more familiar "diamond" shaped kites such as the Malay or Eddy, are tensioned into a bow in order to improve their stability to the point where a tail often becomes unnecessary....
  
  
• Dihedral doors, also known as butterfly doors
  Butterfly doors
  Butterfly doors or vertical doors are a type of door sometimes seen on high-performance automobiles. They are similar to scissor doors, but while scissor doors move up, butterfly doors also move outwards, which makes for easier entry/exit at the expense of saving space.The McLaren F1, Alfa Romeo 33...
  
  
• Dihedral prime
  Dihedral prime
  A dihedral prime or dihedral calculator prime is a prime number that still reads like itself or another prime number when read in a seven-segment display, regardless of orientation , and surface...
  
  , also known as a dihedral calculator prime
• An inside corner of rock; see the glossary of climbing terms
  Glossary of climbing terms
  This page describes terms and jargon related to climbing and mountaineering.-A:American death triangle : An anchor which is created by connecting a closed loop of cord or webbing between two points of protection, and then suspending the rope from a carabiner clipped to only one strand of said anchor...
  
  

See also

• Anhedral (disambiguation)
• Euhedral
  Euhedral
  Euhedral crystals are those that are well-formed with sharp, easily recognised faces. Normally, crystals do not form smooth faces or sharp crystal outlines. Many crystals grow from cooling liquid magma...
  
  , a crystal structure
• Polyhedron
  Polyhedron
  In elementary geometry a polyhedron is a geometric solid in three dimensions with flat faces and straight edges...
  
  , a geometric shape