A person — the same figure as 人person · rén · a human being; other people — with the arms thrown out wide:
this big. The reading is uncontroversial and old; the character
is the middle link of the chain taught in
the opening chapter,
between the walking person and the heaven over both.
How to remember it
Ask a child how big the fish was. The arms go out; that gesture,
frozen into three strokes, is big.