010702, 020126, 191325, 200104, 200505, 241711, 260121, 260131, 280105 - Globes with meridians and parallel lines only. Mechanical men, robots. Other receptacles for laboratory use, including beakers. Artist's easels, palettes, drawing boards, blackboards, clip boards, bulletin boards. Open books. Pi symbol. Circles that are totally or partially shaded. Five or more circles. 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.