Left: black 黑 (The underside of the cooking pot 里 is stained by fire 灬 black.), right: sound/noise 音 (Stand/Get up 立 into the day 日 with sounds [of the alarm clock])
Mnemonic
If the black is standing above the sun, it is a dark sadness.
The app has many other functions, such as character selection according to difficulty, practice programs, handwriting recognition and success statistics!