fretwork; openwork carving
Refers to decorative carving where parts of the material are cut away to create a see-through pattern, common in wood, metal, or ivory.
この欄間には繊細な透かし彫りが施されている。
This transom features delicate openwork carving.
Compound of 透かし (sukashi, 'see-through, openwork') and 彫り (hori, 'carving').