You might remember the meaning of the character 哼 with this easy mnemonic:
Humph! Your mouth (口) is as flat as a lid (亠) and your arms are as long as spears (乛) and as pointy as hooks (亅)! What does my son see in you?
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.