Surface

/ˈhæsəl/

n. "Hot air solder leveling PCB finish dipping copper in molten SnPb/SAC305 then shearing excess via air knives unlike flat ENIG."

/ˈiː nɪdʒ/

n. "Electroless nickel immersion gold PCB surface finish protecting copper pads via Ni barrier + thin Au unlike HASL solder."