The Not Equal To Symbol (≠): Meaning, History, and Usage
The not equal to symbol (≠) is a mathematical operator used to indicate that two values, expressions, or entities are not the same. Visually represented as a standard equals sign with a forward slash through it, this symbol universally communicates inequality, difference, or a mismatch between two items in math, logic, and everyday digital communication.
The origins of the ≠ symbol trace back to the mathematical boom of the 18th century. While Welsh mathematician Robert Recorde invented the standard equals sign (=) in 1557 because he was tired of writing "is equal to," it was Leonhard Euler who later popularized the crossed-out version. In standard mathematical notation, adding a slash through a symbol indicates negation, making ≠ the perfect, intuitive shorthand for "does not equal."
In the Unicode standard, the Not Equal To symbol is designated by the code point U+2260. It lives within the Mathematical Operators block, a collection of characters dedicated to arithmetic, algebra, and logic.
While its roots are firmly planted in mathematics and science, the ≠ symbol has evolved into a versatile tool across different contexts. In everyday typography and social media, it is frequently used to make quick, impactful points or clarify misconceptions. You will often see it in tweets, memes, or casual debates to emphasize that two concepts shouldn't be conflated, such as "wealth ≠ happiness" or "being busy ≠ being productive."
Interestingly, while ≠ is the universal standard in print and logic, it is rarely used in computer programming. Because the character isn't readily available on standard keyboards, most coding languages rely on alternative combinations like !=, <>, or !== to tell a computer that two values are not equal.
Typing the ≠ symbol on modern devices is easier than you might think. On a Mac, simply press Option + =. On Windows, you can type it by holding the Alt key and pressing 8800 on the numeric keypad. If you are typing on an iPhone or Android device, just long-press the equals sign (=) on your screen's number keyboard, and the ≠ symbol will pop up as an option. Web developers can easily insert it using the HTML entity ≠.
This symbol is part of a larger family of relational operators. It stands in direct contrast to the standard equals sign (=), but also shares visual DNA with the almost equal to symbol (≈), which is used for rough approximations, and the identical to symbol (≡), which denotes strict equivalence. Together, these characters help us define exactly how different things relate to one another.