You might remember the oneself radical with this easy mnemonic:
This radical means oneself. If you look closely, it looks like the statue of "The Thinker", by Auguste Rodin. If you don't know what that is, just imagine a person sitting with his hand propped up against his chin, thinking deeply to himself.
Using mnemonics to remember Chinese radicals like oneself has a huge impact on how long to learn Mandarin it takes.