ten grams, (kokuji)
瓧 is a Japanese kokuji that represents a unit of mass: ten grams. Its meaning is entirely tied to this specific measurement.
瓧 is a Japanese kokuji created by combining 瓦 (gram) and 十 (ten) to represent ten grams. It is a modern coinage for a metric unit.
The outer 瓦 stands for 'gram' (as in 瓦 is used for gram in some contexts), and the inner 十 is 'ten'. Together they make ten grams.
For デカグラム, think of a 'deca-gram' as ten grams. The reading is exactly the katakana for decagram: デカグラム.
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