・ 音 シュウ
Sino-Vietnamese: chu
The 辶 (walking) radical with 周 (a circuit): walk one full lap around and a week has gone by. A week is one cycle.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
来週テストがあります。 (らいしゅうてすとがあります)
There is a test next week.