200308, 241725, 250302, 260909, 260912, 261710, 280105 - Graph paper, diagrams, blueprints, the periodic table. Other notational signs and symbols, including pH, hazardous materials symbols, degree sign(�), pound sign(#), equal signs(=), and other mathematical symbols. Backgrounds covered with other squares or rectangles. Squares made of geometric figures, objects, humans, plants or animals. Squares with bars, bands and lines. Zig-zag line(s). 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.