U+21B9 "↹" Leftwards Arrow to Bar over Rightwards Arrow to Bar Unicode Character

U+21B9 "↹" Leftwards Arrow to Bar over Rightwards Arrow to Bar is a typographic symbol that depicts two opposing arrows, each ending in a vertical bar, with the leftward arrow placed above the rightward arrow. This glyph is commonly used in computing and user interface design to represent a keyboard key, specifically the Tab key, which typically shifts focus or indentation one step forward when pressed, and with the Shift key, shifts backward. Its dual arrow structure visually conveys the idea of bidirectional navigation or movement between two states or positions, making it a concise and intuitive icon for tabulation and alignment functions in digital text editing and forms.