Picture of an eye 目 with emphasized eye-brows 首 to express the special: the head or the chief. (When used as a radical often without eye-brows 頁 meaning forehead). It is always at the right side of a character.
Radical 103 疋 stands for clothing or bales of cloth. In the Hanzi-Trainer, it is used synonymously with the correct 正, because it seems helpful for the explanations and the interpretation clothing/cloth bale would be in conflict with other radicals.
The app has many other functions, such as character selection according to difficulty, practice programs, handwriting recognition and success statistics!
