knife handle, hilt
欛 centers on the part of a knife or sword that is held: the handle or hilt.
欛 combines 木 (wood) with 霸, which likely contributes the sound. The wood radical suggests a wooden handle or hilt.
The wood radical 木 on the left suggests a wooden handle, while the right side 霸 looks like a complex blade assembly. Together they form the handle of a knife or sword.
For ハ, imagine gripping the knife handle and letting out a sharp 'ha!' sound as you pull it from its sheath: ha -> ハ.
hilt