This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 刕 is uncertain. It visually consists of three 刀 (knife) components, but its original meaning and formation are unclear.
Three knives stacked together suggest cutting or slicing, but the actual meaning is uncertain. Think of it as a mysterious triple-knife symbol.
For リ, imagine three knives cutting a long reed: reed -> リ, and the triple blades slice through it.