auger, drill, awl, pyramid, cone
錐 centers on a pointed tool that pierces or shapes: an auger, drill, or awl. The pyramid and cone senses extend from the same pointed, tapering shape.
錐 combines 金 (metal) with 隹, which likely contributes the sound. The character originally referred to a metal tool for piercing or boring.
The left side 金 (metal) and the right side 隹 (a bird-like shape) together suggest a metal tool with a sharp, pointed beak: an auger or drill that pierces like a bird's beak.
For スイ, imagine a Swiss-made drill: Swiss -> スイ, and the metal tool 錐 is a precision auger from Switzerland.
round gimlet
drill; gimlet; awl; auger
cone; pyramid
pyramid
trigonal pyramid
triangular pyramid
Triconodonta; Eutriconodonta; order of early mammals
pentagonal pyramid
octagonal pyramid
cone
cone
truncated cone; frustum of a cone
conic projection; conical projection
cone shape
conical pendulum
conic curve; conic section
keratoconus
(circular) conical surface
cream rises to the top; a drill in a bag (will always poke through)
quadrangular pyramid