“constant / usual” in Japanese is 常, read jou, tsune, toko (じょう, つね, とこ). It is a Grade 5 Kyōiku kanji, taught in year 5 of Japanese elementary school, and appears in words such as 日常 (daily life).
What does 常 mean?
毎日が日常だ。
Same sound, different character — the classic trap. Compare them side by side: