260117, 260502, 260509, 260513, 260701, 280105 - Two concentric circles. Plain single line triangles. Triangles made of geometric figures, objects, humans, plants or animals. Two Triangles. Plain diamonds with single or multiple line borders. 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.