Diagrams.TwoD.Arrowheads
tri
dart
halfDart
spike
thorn
lineHead
noHead
arrowheadTriangle
arrowheadDart
arrowheadHalfDart
arrowheadSpike
arrowheadThorn
tri'
dart'
halfDart'
spike'
thorn'
lineTail
noTail
quill
block
arrowtailQuill
arrowtailBlock
type ArrowHT n