This radical is understood as an identical variant of "person" 人, and shows a person who stands with the legs apart. - This radical has several varation, i.e. a lying person , a sitting 匕 person.
In many languages (such as French), short strokes are used above the letters to express an emphasis. This stroke 丶 is used in the mnemonics accordingly.
Tip: Go to the radicals that are contained in this character and learn all the characters with this radical systematically!
The app has many other functions, such as character selection according to difficulty, practice programs, handwriting recognition and success statistics!