曜
ヨウ, てる
weekday
JLPT4 G2 S18 F940
As per 翟# (rise high) + 日 sun/day → brilliant light radiating from the rising sun. *Day of the week* is via the assignment of bright celestial bodies to the names of the days of the week (日 sun 月 moon 火星 Mars 水星 Mercury 木星 Jupiter 金星 Venus 土星 Saturn).
[Full Kanji Etymology List]