KanjiJLPT N1
Nail

nail, tack, peg

Mnemonic

A gold Nail the size of a telephone pole has been driven straight into the middle of the street. Traffic swerves around it, horns blaring, but nobody can pull it out—the gold nail has fused with the asphalt, anchoring the entire street permanently to the earth.
Additional thoughts
Picture the gleaming gold nail towering in the road, immovable. Gold = material, street = where it's stuck. The absurd scale makes it unforgettable.
Quick recall
A giant gold Nail is hammered into the street, impossible to remove.

Details

The keyword for 釘 is nail. This kanji refers to a metal nail or spike, the kind used in construction and carpentry to fasten pieces of wood or other materials together. By extension, it can also carry the sense of pinning something down or driving a point home, as in firmly impressing something upon someone's mind. It is a straightforward and concrete character tied to one of the most basic and essential tools in building and repair.
On'yomi
てい、ちょう
Kun'yomi
くぎ

Used in vocab