small light carriage
軺 centers on a small, light carriage or cart, emphasizing its compact and easily movable nature.
軺 combines 車 (vehicle) with 召, which likely contributes the sound and possibly the idea of summoning or lightness. The exact historical development is uncertain.
The left side 車 is a vehicle, and the right side 召 looks like a person calling out. Imagine a small, light carriage summoned with a quick call, ready to zip away.
For ヨウ, picture a small light carriage being pulled by a yo-yo string: yo -> ヨウ, and the carriage bounces lightly along.