The word(s) "course" appears 34 time(s) in 31 verse(s) in Quran in Abdullah Yusuf Ali translation.

(31) Such of your women as have passed the age of monthly courses, for them the prescribed period, if ye have any doubts, is three months, and for those who have no courses (it is the same): for those who carry (life within their wombs), their period is until they deliver their burdens: and for those who fear Allah, He will make their path easy.