260503, 260508, 260512, 260516, 260521, 280105 - Incomplete triangles (must have two angles). Letters, numerals or punctuation forming the perimeter of a triangle, bordering the perimeter of a triangle or forming a triangle. Triangles with bars, bands and lines. Triangles touching or intersecting. Triangles that are completely or partially shaded. Inscriptions in Greek characters, including the following: Α α Β β Γ γ Δ δ Ε ε Ζ ζ Η η Θ θ Ι ι Κ κ Λ λ Μ μ Ν ν Ξ ξ Ο ο Π π Ρ ρ ς Σ σ Τ τ Υ υ Φ φ Χ χ Ψ ψ Ω ω.