• 毎週まいしゅう — every week
• 先週せんしゅう — last week
• 来週らいしゅう — next week
• 今週こんしゅう — this week
• 週末しゅうまつ — weekend

The kanji 週 combines 周 (to go around) with the 辶 (movement) radical, suggesting the idea of something recurring regularly — like the cycle of a week.