日課
にっか · nikka · JLPT N2 · noun
work
📅 日課 = 日 (day) + 課 (lesson/task): a lesson you do every day, so daily work or routine
日 means day and 課 means lesson or assignment. Put together, 日課 is the task you do each day, which is your daily routine.
日 — pictograph of the sun
日 is a pictograph of the sun, originally drawn as a circle with a dot or stroke inside representing the sun's substance. Over time the round shape was squared off into the modern rectangular form. It means 'sun' and by extension 'day'.