Old Hungarian Capital Letter Aa (U+10C81) is a Unicode uppercase letter from the Old Hungarian block. It resides on Plane 1 (SMP, Supplementary Multilingual Plane), has bidirectional class R (right-to-left), is not mirrored, and has combining class 0 (Not Reordered). In HTML it can be written as 𐲁 or 𐲁. Because it is outside the Basic Multilingual Plane, proper font support is required; otherwise a fallback box may be shown.