芯 - wick

wick; marrow; staple (for stapler); (pencil) lead; stuffing; pith

lead of a pencil

padding; lining; foundation

staple (for a stapler)

toilet drain outlet

mentally strong; strong-willed

mechanical pencil lead

spare pencil lead; pen refill (cartridge); replacement wick (e.g. of a lantern)

pencil lead case (for a mechanical pencil)

collar core (stiff fabric, etc. inside a collar)

lamp wick

centering; center alignment