Diagonal
Diagonal may refer to:
- A specific direction (or set thereof) on most regular grids, halfway between any two given orthogonal directions - refer to:
- Square tiling#Symmetric directions
- Cubic honeycomb#Symmetric directions
- Tesseractic honeycomb#Symmetric directions
- Penteractic honeycomb#Symmetric directions
- Hexeractic honeycomb#Symmetric directions
- Hexagonal tiling#Orthogonal and diagonal directions
- Triangular tiling#Orthogonal and diagonal directions
- 16-cell honeycomb#Symmetric directions
- 24-cell honeycomb#Symmetric directions
- Several units of measurement: