針金
はりがね · harigane · JLPT N2 · noun
wire
🔌 針金 = 針 needle + 金 metal: a metal strand as thin as a needle
The reading はりがね keeps 金 as gane (metal) and 針 as hari (needle). Wire is metal drawn out thin, like a needle.
金 — roof 亼 + two dots (metal nuggets) + earth 土
Originally a pictograph of metal nuggets buried in the earth beneath a covering, with the two dots representing pieces of ore. It first meant 'metal' broadly, then narrowed to 'gold' as the most precious metal, and by extension 'money'.