Calendar year

The triliteral root ʿayn wāw mīm (ع و م) occurs in the Quran 9 times.

Noah's one thousand year less fifty calendar years

(29:14) We had sent Noah to his people, so he stayed with them one thousand year less fifty calendar years (Arab. عَامًا, ʿāman). Then the flood took them while they were wicked.

twice in (2:259), (9:28), twice in (9:37), (9:126), (12:49), (31:14)