The ⊠ (Squared Times) Symbol: Meaning, Math, and How to Type It
The ⊠ symbol, officially known in Unicode as the Squared Times (U+22A0), is a mathematical operator featuring a standard multiplication cross enclosed within a square. Originally designed for advanced mathematical and algebraic notation, it is primarily used to represent specific matrix operations, abstract algebra functions, or tensor products. Beyond its technical origins, internet users frequently repurpose ⊠ as a stylistic alternative to a crossed-out checkbox or an error indicator in digital text.
Added to the Unicode Standard back in version 1.1 in 1993, the ⊠ symbol (sometimes informally indexed as Math Operator 157) resides in the Mathematical Operators block. Its designated code point is U+22A0. While it shares visual similarities with everyday typography icons, it was strictly encoded to help scientists, mathematicians, and programmers accurately digitize complex formulas and logic problems.
In the realm of mathematics and physics, ⊠ acts as a specialized multiplier. It often represents the Kronecker product or specific types of tensor operations that require a visual distinction from standard multiplication (×) or the circled times symbol (⊗). In computer science and programming, you might spot it in logic gating or specialized relational algebra dealing with complex data arrays.
Outside of the lab and the lecture hall, ⊠ has found a second life in typography and social media. Because it perfectly resembles a tiny square with an 'X' inside, people often use it as a makeshift negative checkbox. You will see it pop up in digital to-do lists, aesthetic social media bios, or informal polls to indicate a "no" or a "fail." It brings a clean, geometric look to plain text formatting.
Typing the Squared Times symbol depends on your device, but copy-pasting is always the fastest route. If you want to type it manually on Windows, you can use the Alt code shortcut by holding the Alt key and typing 8864 on your numeric keypad. On a Mac, switch your keyboard to Unicode Hex Input, then hold Option and type 22A0. For web developers, the HTML entity ⊠ or ⊠ will render the symbol perfectly on any webpage.
If you are looking for a true checkbox rather than a math operator, you are probably looking for the Ballot Box with X (☒, U+2612), which is the standard typographical choice for digital forms. Other mathematically related symbols include its direct counterparts, the Squared Plus (⊞, U+229E) and the Squared Minus (⊟, U+229F).