About LEFT SQUARE BRACKET WITH TICK IN BOTTOM CORNER
Left Square Bracket With Tick In Bottom Corner (U+298F) is a Unicode open punctuation from the Miscellaneous Mathematical Symbols-B block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class ON (other neutrals), is mirrored, and has combining class 0 (Not Reordered). In HTML it can be written as ⦏ or ⦏.