siren

flute

(Western) concert flute

steam whistle; ship horn

bagpipes

to hoot; to whistle

a whistle

recorder (musical instrument) (Tw)

(Tw) recorder (musical instrument)

piccolo

recorder (musical instrument); (Tw) clarinet

membrane which covers a hole in a flute and produces a buzzing tone

Qiang flute

Beijing Midi School of Music, est. 1993 (abbr. for 北京迷笛音樂學校|北京迷笛音乐学校[Bei3 jing1 Mi2 di2 Yin1 yue4 Xue2 xiao4])

ocarina (musical instrument)

René Descartes (1596–1650), French philosopher, mathematician and scientist

René Descartes (1596-1650) French philosopher

Girard Desargues (1591–1661), French geometer

(math.) Cartesian coordinate system