∟ Right Angle Symbol: Meaning, History, and How to Type It
The ∟ (Right Angle) symbol is a mathematical character used in geometry to represent an angle of exactly 90 degrees. Formed by two perpendicular lines intersecting, it serves as a universal shorthand in technical drawings, architectural blueprints, and mathematical proofs to denote a perfect corner.
In the Unicode standard, the Right Angle is officially assigned the code point U+221F and resides in the Mathematical Operators block. Introduced early in Unicode version 1.1 in 1993, this character was essential for digitizing scientific and mathematical texts long before the colorful emojis of today took over our keyboards.
While its primary home is in the classroom or the drafting table, the ∟ symbol pops up in a surprisingly wide variety of contexts. In geometry, you will see it used to define shapes, such as noting that ∟ABC is a right angle. In programming and typography, users sometimes repurpose it as a visual bracket, a bullet point alternative, or a component in elaborate text-based ASCII art. Social media users occasionally sprinkle it into complex kaomoji (Japanese text emoticons) to form specific facial features, robot limbs, or framing devices.
Typing the ∟ symbol depends on your device and operating system. On a Windows PC, you can generate it by holding down the Alt key and typing 8735 on the numeric keypad. If you are working in Microsoft Word, you can simply type 221F and immediately press Alt + X. Mac users can easily find it by pressing Control + Command + Space to open the Character Viewer and searching for "right angle." For web developers, the symbol renders perfectly in HTML using the named entity ∟ or the decimal code ∟.
Be careful not to confuse the Right Angle with its close relatives in the Unicode library. The ∠ (Angle) symbol (U+2220) represents any generic angle, while the ⦜ (Right Angle with Square) symbol (U+299C) includes a tiny square inside the corner for absolute mathematical clarity. If you are designing user interfaces or terminal boxes, you actually want the └ (Box Drawings Light Up And Right) character (U+2514). Finally, if you want to bring a pop of color to a casual text message about math, school, or construction, the 📐 (Triangular Ruler) emoji is your best visual bet.