Circle: VV; square: VΛ; triangle: ΛΛ ; blank: ΛV vs. circle: ΛΛ; square: ΛV; triangle: VV; blank: VΛ.
Adjacent-numbered pages: BP116 BP117 BP118 BP119 BP120  *  BP122 BP123 BP124 BP125 BP126
arbitrary, consistentsymbols, traditional
Douglas R. Hofstadter