I. ˈhüz- noun
Usage: often capitalized both Ws
Etymology: from the expression who is who, who's who
1. : any of various compilations containing brief biographical sketches of distinguished or prominent persons in a geographical area or a professional or other group
a list of officers and members … and a who's who of cartographers — Geographical Review
2. : the leaders of a community or group : those exercising influence or power : elite
the event will draw … the who's who of the film capital — Los Angeles (Calif.) Examiner
II. noun
: a listing or grouping of notable persons or things