TOW (& Answer)....

The week’s question was what does the term rak’a refer to? Rak’a is a term that literally means “bowing.”  In Islam the rak’a is a "’unit of prayer’ in which the worshiper recites a number of ritual prayers and invocations while standing, bowing, prostrating and sitting."

The question (& answer) were taken from p. 211 of A Popular Dictionary of Islam by Ian Richard Netton.  The book was published by Humanities Press International in 1992.