30th day of the month; 30 days
31st day of the month; 31 days
Thirty Years' War (1618-1648)
38th parallel (that demarcates North Korea and South Korea)
turning thirty and therefore becoming independent; at thirty, one stands on one's own
Naoki Prize (literary award)
32nd anniversary of death
the thirty-six immortal poets (of the Heian period; as named by Fujiwara no Kintō)
thirty-three temples sacred to Kannon (Avalokitesvara)
32nd note; demisemiquaver
the thirty guardian deities (one for each day of the lunar month)
last 32 (in a tournament); round of 32
30 km/h zone (area in which the speed limit is 30 km/h)
36 Initials (system for transcribing initial consonants of Middle Chinese)