three R’s (reading, ‘riting, ‘rithmetic)
three points in a good landing
Three Signs of Being in Buddhism (impermanence, suffering, absence of soul)
four seasons
four classical elements (Earth, Water, Air, Fire)
four states of matter (solid, liquid, gas, plasma)
four humors of Hippocrates (black bile, yellow bile, phlegm, blood)
four temperaments of Hippocrates (sanguine, choleric, melancholic, phlegmatic)
four points on a compass
four freedoms (of speech, of worship, from want and fear – Franklin Roosevelt, 1941)
five ages of Man
five senses
five Great Lakes (North American)
Five Nations (Mohawk, Oneida, Onondaga, Cayuga, Seneca)
six types of quarks (up, down, top, bottom, strange, charm)
six types of leptons (electron, electron neutrino, muon, muon neutrino, tau, tau neutrino)
Seven Seas (varies locally and is often idiomatic; list most often accepted today is North Atlantic, South Atlantic, North Pacific, South Pacific, Arctic, Southern, Indian)
seven continents
Seven Hills of Rome
Seven Wonders of the World
Seven Deadly Sins (lust, gluttony, greed, sloth, wrath, envy, pride)
eight bits in a byte
eight days (and nights) in Hanukkah
eight legs on a spider
eight tentacles on an octopus
eight vertices in a cube
eight paths to the Buddha’s Four Noble Truths
eight planets in our solar system (now that Pluto is a Dwarf)
nine muses in Greek mythology
nine circles of hell in Dante’s Divine Comedy
twelve pence in a shilling
29.531 days in the lunar month
365.25 days in the solar year
100 billion stars in the Milky Way galaxy
100 billion galaxies in the universe
100 billion neurons in the human brain
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