Left: fish 鱼/魚 (... with mouth ⺈, body 田 and tail fin 灬), right: person above 60 years 耆 (老 [Old man 耂, sitting person 匕], sun 日)[old man 耂 & order, purpose 旨]
Mnemonic
At the fish they give like an old man 耂 (with the fingers 指), the orders 旨: the fins.
This radical was developed from a circle with a central dot as the image of the sun. As you can hardly draw circles or dots with a brush, it became the current rectangular shape.
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