Left: hill 阝(also mountain ridge), right: to show 示 (image of an altar 丁 with a sacrifice 一 and dripping blood 八)
Mnemonic
(The Chinese wall was built over the hills and mountain ridges, as this provided a better overview and made it more difficult for the enemy to capture) The hill shows (= in the sense of: 'is there') the border.
This radical shows a hill. This radical 阝 is always on the left of the hanzi. (Please note that this relatively similar radical ⻏ stands for “village” and is in the character always on the right.)
The app has many other functions, such as character selection according to difficulty, practice programs, handwriting recognition and success statistics!
