Meanings

Japanese typewriter

spherical harmonics

peacelessness

clathrate hydrate

broken chord

Boxer Rebellion (1899-1901)

seasoning of grated daikon with soy and vinegar, usu. for fish or vegetables

neutralization reaction

Okinawan Japanese

augmented chord

tetrad

major chord

diminished chord

harmonic series

partial sum (of a sequence)

Paris Peace Conference (1919)

algebraic sum

Shōwa Station (Antarctica)

Emperor Shōwa (1901-1989, reigned 1926-1989)

traditional Japanese steel (e.g. used in swords)