The big 大 person with the extra 一 caring arms. (Further radicals with „person“ are: sitting 匕, sitting cross-legged 夂, lying , kneeling ⺈, skilled才, bending マ,卩 or slumped 㔾 person)
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.
Vocabulary
代替
dài tì
instead; to replace; to substitute (X for Y, or a number in an algebraic expression)
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, kneeling 
