Meanings

a bird in the hand is worth two in the bush

beginning to learn (something) when one is old

the thirty guardian deities (one for each day of the lunar month)

first system to rank officials into 12 levels (603 CE)

Seventeen-Article Constitution (of Asuka-period Japan)

October Revolution (Russia, 1917)

hexadecimal

36 Initials (system for transcribing initial consonants of Middle Chinese)

decennial

babies born on October 10, supposedly conceived on New Year's Day

the thirteen buddhas, bodhisattvas and wisdom kings

twelve coinages minted in Japan during the Nara and Heian periods

the twelve gates of Heian Palace

eighteen centers of Buddhist learning (of the Pure Land sect in the Kanto region)

Twenty-Four Histories

Twenty-Five Histories

eighteen centers of Buddhist learning (of the Pure Land sect in the Kanto region)

Nippon Decimal Classification

many gods

ten rulers of the afterlife (who judge the dead and determine their placement in their next life)