Of telephone numbers dialed in North America, widely used for fictional numbers in television shows, films, and other media.

(music) A chord progression, l–vi–IV–V, used in Western popular music, particularly common in the 1950s and early 1960s.

(US, taxation, organizations) An organization that complies with section 501(c)(4) of the U.S. federal tax code. A non-profit organization exempt from some federal income taxes, due to being dedicated social welfare purposes.

(US, taxation, organizations) An organization that complies with section 501(c)(3) of the U.S. federal tax code. A non-profit organization exempt from some federal income taxes, due to being dedicated to charitable, religious, educational, scientific, public safety, promotion of amateur sport at the national or international level, prevention of cruelty to women or children or animals, or literary purposes.