test; trial; ordeal; tribulation
briquette (charcoal or coal)
ornamental tile; facing bricks
art of making elixirs (e.g. in Chinese trad. medicine); alchemy
training; drill; practice; practising; discipline
refining; refinement; smelting; training
elixir of life (prepared from cinnabar in ancient China)
hollow brick (used for thermal isolation or moisture proofing)