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OBAFGKM
Spectral classes of stars.
COSDSPTJCPEOMPPR
Geological periods: Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous, Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, and Recent.
SMHEO
The order of the Great Lakes from west to east: Superior, Michigan, Huron, Erie, Ontario.
WAJMMAJV
The first eight U.S. presidents: George Washington, John Quincy Adams, Thomas Jefferson, James Madison, James Monroe, John Quincy Adams, Andrew Jackson, Martin Van Buren.
DKPCOFGS
The order of taxa in biology: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
TGCFAOQTCD
Mohs scale of mineral hardness: Talc(=1) Gypsum(=2) Calcite(=3) Fluorite(=4) Apatite(=5) Orthoclase(=6) Quartz(=7) Topaz(=8) Corundum(=9) Diamond(=10).
ROYGBIV
Visible spectrum: red, orange, yellow, green, blue, indigo, violet.
