十

tanka; 31-mora Japanese poem

118 (maritime emergency telephone number in Japan)

21st century

30 km/h zone (area in which the speed limit is 30 km/h)

Geometry

dodecagon

D-pad (directional keypad on a video game controller, remote control, etc.)

15 puzzle; game of fifteen; 4x4 sliding puzzle

Japanese mythology

god of evil; god who causes many disasters

lost thirty years; period of economic stagnation in Japan that began ca. 1991

necessary and sufficient

Organization name

International Federation of Red Cross

Organization name

International Federation of the Red Cross; IFRC

Organization name

Jūmonjigakuen Women's University

Organization name

International Federation of Red Cross and Red Crescent Societies

Organization name

Japanese Red Cross Hokkaido College of Nursing

Organization name

The Japanese Red Cross Hiroshima College of Nursing

Organization name

Japanese Red Cross Toyota College of Nursing

Organization name

Japanese Red Cross Kyushu International College of Nursing

Organization name

Japanese Red Cross Akita College of Nursing

Organization name

Japanese Red Cross Junior College of Akita

Organization name

Japanese Red Cross College of Nursing

Service

Jukkokutōge Cable Car

Company name

The Hyakujushi Bank; 114 Bank

Work of art, literature, music, etc. name

The Decagon House Murders (1987 novel by Yukito Ayatsuji)