U+21DE "⇞" Upwards Arrow with Double Stroke Unicode Character

U+21DE "⇞" Upwards Arrow with Double Stroke is a typographic symbol from the Arrows block, characterized by an upward pointing arrow that features two parallel vertical strokes instead of a single shaft, giving it a bold or emphasized appearance. It is often used in mathematical notation, computing, or diagrammatic contexts to represent concepts such as strict increase, logical implication, or a directional shift with added significance. While not as common as standard single stroke arrows, its double line design visually distinguishes it for applications requiring a stronger or more formal indication of upward movement or progression.