Not Equal Sign (≠): Meaning, How to Type It, and Uses Explained

The not equal sign (≠) is the universal symbol for inequality, but its keyboard input varies wildly across devices. Whether you’re solving algebra problems or writing JavaScript conditions, knowing how to type and interpret this character saves time and prevents errors.

Unicode code point: U+2260 · Mac keyboard shortcut: Option + = · Windows keyboard shortcut: Alt + 8800 (numeric keypad) · Common code alternative: !=

Key facts about the not equal sign

“The not equal sign is the direct opposite of the equals sign.” – Mathnasium

The not equal sign is the logical opposite of the equals sign. When you see a ≠ b, it means a and b do not denote the same value. That’s the core idea, and it works whether you’re dealing with numbers, variables, or more abstract expressions.

“In English-language educational pages, the symbol is often read as ‘not equal to’ or ‘does not equal.’” – Cuemath

What does ≠ mean in text?

The not equal symbol indicates that two values are different. It belongs to the family of inequality symbols alongside <, >, ≤, and ≥. (SplashLearn) In formal mathematics, a ≠ b is a logical negation of equality. (MathWords) The symbol works even when ordering is not defined, such as with complex numbers. (e-Words)

The symbol also has alternate names: “not equal to” sign, “does not equal”, and in casual conversation, “not equals” or simply “is not”. The meaning stays the same.

How to type ≠ on keyboard?

Typing the not equal sign is straightforward once you know the shortcuts for your device. Here are the steps for the most common platforms.

1. Windows: Hold down the Alt key and type 8800 on the numeric keypad (Num Lock on). No numeric keypad? Use Character Map or copy-paste.
2. Mac: Press Option + = (the equals key) to produce ≠.
3. Mobile (iPhone/Android): No dedicated key. Search “not equal sign” in a browser, copy the symbol, and paste. On Gboard, create a text replacement shortcut.
4. Google Docs / Word: In Docs, go to Insert > Special characters, search “not equal”. In Word, use Alt code or Insert > Symbol.

The implication: memorizing just the Mac shortcut and one Alt code covers most desktop needs.

What does ≅ mean?

The symbol ≅ (U+2245) means “congruent to” or “approximately equal to”. In geometry, it denotes congruence of shapes (same shape and size). In some contexts, it is used interchangeably with ≈, but ≅ is more formal for exact equivalence. (Underleaf AI)

What does ~= mean?

The operator ~= is the not-equal operator in Lua and some other languages. (Underleaf AI) Most mainstream languages use != or <> instead. In mathematical contexts, ~= sometimes indicates approximate equality.

What’s the difference between ≈ and ∼?

The ≈ symbol (U+2248) means “approximately equal to” – used in rounding, estimation, and scientific contexts. The ∼ (tilde) has multiple meanings: similarity in geometry, proportionality, and in statistics “distributed as”. (Underleaf AI) The catch: using the wrong symbol can change the mathematical meaning entirely.

How different languages handle it

The pattern: ASCII-safe operators dominate because they work across all systems without encoding issues.

When you should (and shouldn’t) use ≠

The not equal sign works perfectly in mathematical notation and casual written communication. When writing code, use the programming operator (!= or <>) instead of the Unicode character. Mixing the two can cause errors or confuse other developers.

What we know vs. what’s uncertain

• Confirmed: The symbol ≠ is encoded in Unicode (U+2260) and is available on virtually all modern devices. (Codersera)
• Confirmed: On Mac, Option+= produces the ≠ symbol. (NotEqualSign.com)
• Unclear: The exact origin of the symbol ≠ is not widely documented.
• Unclear: No consensus on which programming language first adopted != for inequality. (Underleaf AI)
• Unclear: Whether the symbol was used in ancient Greek mathematics is uncertain.

The Unicode and HTML story

The ≠ symbol is part of the Unicode standard under code point U+2260. It sits in the Mathematical Operators block, alongside other inequality symbols like ≤ (U+2264) and ≥ (U+2265). For HTML, use ≠ or ≠.

Related symbols: ≈ (U+2248) means “almost equal to”, ≅ (U+2245) means “congruent to”. Using the right symbol matters because each has a specific mathematical or programming meaning.

The not equal sign’s lesser-known name

In some contexts, people call the ≠ sign the “inequality sign” or simply “not-equal.” Another name is “not equivalent” sign, though that term is more common for ≢. Older math texts often use the phrase “is not equal to” alongside the symbol.

Frequently asked questions

Summary

The not equal sign (≠) is a simple yet powerful symbol that bridges the worlds of math and everyday communication. Whether you’re a student solving equations or a developer debugging code, the not equal sign and its text equivalents provide a reliable way to express inequality—just remember to use the right form for your context.