support structure for bell
虡 refers to a physical support structure, specifically the frame or stand used to hold a large suspended bell.
虡 is a phono-semantic compound with 虍 (tiger stripes) suggesting the sound and 異-like lower part possibly indicating a stand. The exact historical development is uncertain.
The outer shape 虚 looks like a hollow frame, and the inner strokes resemble a bell hanging inside. Picture a sturdy wooden stand cradling a heavy bell.
For キョ, imagine a giant bell supported by a frame that echoes with a deep 'kyo' sound when struck: kyo -> キョ.