It's derived from the adjective "pink" meaning small, which goes back to the sixteenth century. Anything else AnswerParty can answer?
Pinky and the Brain
Pinky and the Brain is an American animated television series. It was the first animated television series to be presented in Dolby Surround and the fourth collaboration of Steven Spielberg and Warner Bros. Animation. The characters first appeared in 1993 as a recurring segment on Animaniacs and then from 1995 to 1998, they were spun off into their own show on The WB Television Network, Steven Spielberg Presents Pinky and the Brain, with 65 episodes produced. Later, they appeared in the unsuccessful series, Steven Spielberg Presents Pinky, Elmyra & the Brain.
Pinky and Brain are genetically enhanced laboratory mice who reside in a cage in the Acme Labs research facility. Brain is self-centered and scheming; Pinky is good-natured but feebleminded. In each episode, Brain devises a new plan to take over the world, which ultimately ends in failure, usually due to Pinky's idiocy, the impossibility of Brain's plan, Brain's own arrogance, or just circumstances beyond their control. In common with many other Animaniacs shorts, many episodes are in some way a parody of something else, usually a film or novel. The opening song is preceded by the following dialogue:
To pinky swear, or make a pinky promise, is the entwinement of the little fingers "(pinkies)" of two people to signify that a promise has been made. It is often seen in anime, where it is called a yubikiri (指切り Japanese for "Finger Cut-off").
In the United States, the pinky swear has existed since at least 1860, when Bartlett's Dictionary of Americanisms listed the following rhyme accompanying the promise:
Pink Floyd were an English rock band that achieved international acclaim with their progressive and psychedelic music. Distinguished by their use of philosophical lyrics, sonic experimentation, and elaborate live shows, they are one of the most commercially successful and musically influential groups in the history of popular music.
Founded in 1965, Pink Floyd originally consisted of students Syd Barrett, Nick Mason, Roger Waters, and Richard Wright. They first gained popularity performing in London's underground music scene during the late 1960s, and under Barrett's creative leadership they released two charting singles and a successful debut album. David Gilmour joined as a fifth member in December 1967, and Barrett left the band in April 1968 due to his deteriorating mental health. After Barrett's departure, Waters became the band's primary lyricist and by the mid-1970s, their dominant songwriter, devising the original concepts behind their critically and commercially acclaimed albums The Dark Side of the Moon (1973), Wish You Were Here (1975), Animals (1977), The Wall (1979) and The Final Cut (1983).
The little finger, often called the pinky in American English, pinkie in Scottish English (from the Dutch word pink, "little finger"), or small finger in medicine, is the most ulnar and usually smallest finger of the human hand, opposite the thumb, next to the ring finger.
There are four muscles that control the little finger: Three intrinsic muscles comprising a group called the hypothenar eminence, and one extrinsic, the extensor digiti minimi: