sculling oar
梶 centers on a specific type of oar used for sculling, a rowing technique where a single oar at the stern propels and steers a boat. The meaning is narrow and technical, tied to this particular boating implement.
梶 combines 木 (tree/wood) with 尾 (tail), likely indicating a wooden tail-like implement used at the stern of a boat. The exact historical development is uncertain, but the component choice fits the sculling oar meaning.
A wooden 木 tail 尾 at the back of a boat: that's a sculling oar. Picture the oar moving side to side like a fish's tail, propelling the boat forward.
For ビ, imagine a bee buzzing around the wooden oar as you scull: bee -> ビ, and the bee's hum matches the rhythm of the oar.
paper mulberry (Broussonetia papyrifera)
marlin; swordfish; spearfish; sailfish
paper mulberry (Broussonetia papyrifera)
shafts (of rickshaws or similar vehicles); thills
horned maple (Acer diabolicum)
Indo-Pacific sailfish (Istiophorus platypterus)
Indo-Pacific blue marlin (Makaira mazara)