Duployan Double Mark (U+1BC9E) is a Unicode nonspacing mark from the Duployan block. It resides on Plane 1 (SMP, Supplementary Multilingual Plane), has bidirectional class NSM (nonspacing mark), is not mirrored, and has combining class 1 (Overlay). In HTML it can be written as 𛲞 or 𛲞. Because it is outside the Basic Multilingual Plane, proper font support is required; otherwise a fallback box may be shown.