The cheon "heaven" or "sky", ji "earth", hyeon "black", and hwang "yellow" or "gold" names are not significant, being the first four characters of the Thousand Character Classic, thus making them equivalent to Cannons A, B, C, and D.
Generally, "rare saegim vocabularies" are presumed to be pre-16th century, for it is thought that they may be a fossilized form of native Korean vocabulary or affected by the influence of a regional dialect in Jeolla Province.
classic rock | Classic rock | SpongeBob SquarePants (character) | classic hits | cult classic | Jerry Seinfeld (character) | Cotton Bowl Classic | VH1 Classic | Classic Rock | Classic FM | ABC Classic FM | Classic FM (UK) | Xuanzang (fictional character) | classic | Twenty Thousand Leagues Under the Sea | Thousand Islands | Thousand Foot Krutch | The Hero with a Thousand Faces | The Ghost of a Thousand | Sonic the Hedgehog (character) | Player character | One Thousand and One Nights | Forrest Gump (character) | World Baseball Classic | Prefontaine Classic | player character | Noddy (character) | ESPN Classic | Classic | Boeing 737 Classic |
The Thousand Character Classic is a 1000-character poem in which each character is used exactly once, but it does not include all Chinese characters.
During the Ming and Qing dynasties, the Three Character Classic formed the basis of elementary education, along with 2 other primers, Hundred Family Surnames and Thousand Character Classic.