a qualified worker or master of a trade or craft

an experienced or veteran master in a specific trade or skill, often implying respect for their long-term expertise.

Fu Zuoyi (1895–1974), Chinese general and politician, Nationalist commander who negotiated the peaceful surrender of Beiping (Beijing) to the Communists in 1949, and later held senior posts in the PRC government

Charles Fourier (French sociologist and socialist, 1772-1837)

Jean-Baptiste-Joseph Fourier (French mathematician, 1768-1830)

Foucault's pendulum

Michel Foucault (1926-1984), French philosopher (Taiwan usage)

(math.) Fourier transform

Fu Shuo (c. 14th century BC), a legendary sage and principal minister of the Shang ruler Wu Ding

(Catholicism) extreme unction (the sacrament of Anointing of the Sick)