Han character U+2D3FF

JavaScript uses a braced escape; JSON needs two four-digit escapes.

In a JavaScript string, use \u{2D3FF}. JSON’s \u escape takes four hexadecimal digits, so represent 𭏿 with \uD874\uDFFF.

What does 𭏿 mean in a Zhuang song?

Read it in the surrounding lyric.

Unicode’s source reference GPGLG-5008 points to the Zhuang Folk Song Culture Series: Pingguo County Liao Songs (2004–2006), a collection from the Zhuang community in Guangxi, China. Liao songs were passed orally before written collections, then recorded and edited by Zhuang writers in Old Zhuang characters. Old Zhuang folk writing used Chinese character forms, sounds, and meanings to write Zhuang from the Tang and Song dynasties onward.