Keng
original: ? (劥, 吭, 坈, 坑, 奟, 妔, 挳, 揁, 摼, 殸, 牼, 硁, 硜, 硻, 誙, 銵, 鍞, 铿, or 阬 ?)
According to Sachs a synonym of Šêng, to which he refers, even though he doesn’t mention this spelling in the paragraph on p.369.
Sachs, Curt: Real-Lexikon der Musikinstrumente: zugleich ein Polyglossar für das gesamte Instrumentengebiet [Berlin, 1913]. Hildesheim, 1964 [facsimile].