The kanji 曜 generally represents "day of the week" or "weekday" in Japanese. It signifies the celestial bodies that are traditionally associated with each day.

・On-yomi (音読み): ヨウ (you) ・Kun-yomi (訓読み): None, as the meaning is inherent in the character's use within words.

⚫︎ 月曜 (getsuyou) Translation: Monday (literally "moon day") ⚫︎ 火曜 (kayou) Translation: Tuesday (literally "fire day") ⚫︎ 金曜日に映画を見に行きます (Kinyoubi ni eiga o mi ni ikimasu) Translation: I will go to see a movie on Friday.

The kanji 曜 is a phono-semantic compound. It combines two elements: ⚫︎ The radical 日 (hi, -bi, nichi), which means "sun" or "day." This provides the semantic (meaning) component, indicating the connection to time and days. ⚫︎ The phonetic component 翟 (teki), which suggests the sound "you". In this context, it contributes to the pronunciation. Together, these two parts create 曜, representing the concept of a "day of the week." It's a way of denoting each day by associating them with celestial bodies: the sun, moon, and visible planets like Venus, Mars, and so on.