Meanings

seventeen main pavilions of the imperial palace

twenty questions (game)

decapods

the ten precepts

twentieth day of the first month (end of New Year celebrations, upon which remaining New Year's food is eaten, decorations are stowed away, etc.)

Harvest festival held on the night of the tenth day of the tenth month (to send the rice paddy gods back to the mountains after harvest)

ten-night memorial service (6th to 15th days of the 10th month in the lunar calendar)

Buddhist theory of the twelve-fold chain of causation, interdependent origination and co-dependent arising (San: pratītya-samutpāda)

limitless time and space

Ten Bulls (ten stages of the herding of an ox, used as an analogy for training the mind on the path to enlightenment)

twelve devas (esp. of the Shingon sect)

cross-head screw

eighteen components of perception (six sense objects, six sense faculties, six sense consciousnesses)

cross-head screw

decagon

Northern Cross (asterism)

Twelver Shiism (branch of Shia Islam)

to have a cross to bear

thirteen orphans

many