磁 is a bound form (b.f.) that cannot stand alone as a word; it always appears as a morpheme in compound words. Its most common meaning is 'magnetism' or 'magnetic', found in words like 磁铁 (magnet), 磁场 (magnetic field), and 磁力 (magnetic force). Historically it also meant 'porcelain' (now usually written as 瓷), and in some dialects it can mean 'solid' or 'firm' (e.g., 磁实), but these uses are rare in modern standard Chinese.