・ 音 キ 🔊
Sino-Vietnamese: kỷ
Thread 糸 plus the phonetic 己: the end of a thread that keeps things in order, hence records and eras.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
今は二十一世紀です。 (いまはにじゅういっせいきです)
It is now the twenty-first century.