Bamboo-over-鐸 ideograph

𮇁 is a Han ideograph from the character family used in Chinese, Japanese, and Korean writing, with 竹 (“bamboo”) above 鐸, a traditional character for a large bell. That construction identifies the form, not a definition of the whole character. A digitized transcription of the Ming-dynasty collection 太函集 places it in “升聞居𮇁居,” in a passage about a residence; that context does not tell you how to pronounce it.