Origin unclear, but typically explained as being stuck between something above (上) and something below (下). The uses of 卡 to mean "card" or "calorie" are foreign phonetic loans.

Phonosemantic compound. 亻 represents the meaning and 农 represents the sound. Simplified form of 儂.

Phonosemantic compound. 頁 represents the meaning and 豆 represents the sound. The simplified character 头 was adapted from the cursive form of the traditional character 頭.

Phonosemantic compound. 亻 represents the meaning and 農 represents the sound.

Phonosemantic compound. 頁 represents the meaning and 豆 represents the sound.