Old Persian Number One (U+103D1) is a Unicode letter number from the Old Persian block. It resides on Plane 1 (SMP, Supplementary Multilingual Plane), has bidirectional class L (left-to-right), is not mirrored, and has combining class 0 (Not Reordered). In HTML it can be written as 𐏑 or 𐏑. Because it is outside the Basic Multilingual Plane, proper font support is required; otherwise a fallback box may be shown.