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- Symbol:Σ
- Name:Sigma
- Unicode:
U+03A3 (Capital), U+03C3 (lowercase) - HTML Entity:
Σ , σ - LaTeX:
\Sigma , \sigma
The Sigma Symbol (Σ, σ) in Mathematics & Statistics
The Sigma symbol (Σ, σ) is the eighteenth letter of the Greek alphabet. In math and science, both the uppercase and lowercase forms have critical roles:
- Capital Sigma (Σ): Used as the summation operator to represent the addition of a sequence of numbers, terms, or functions.
- Lowercase Sigma (σ): Used to represent standard deviation in statistics, mechanical stress in engineering, electrical conductivity in physics, or the Stefan-Boltzmann constant.
How to Use and Copy the Sigma Sign Online
Copying the Sigma symbol is extremely simple. Use the copy button on the display card at the top to grab the uppercase Sigma. You can also write Sigma or the LaTeX commands \Sigma and \sigma in the tool, or draw the symbol directly to select it from the candidates list.
Common Mathematical Equations Using Sigma
Sigma appears in many fundamental equations, particularly in algebra, calculus, and statistics:
- Summation: $\sum_{i=1}^n i$ represents the sum of numbers from 1 to $n$.
- Standard Deviation: $\sigma = \sqrt{\frac{\sum(x - \mu)^2}{N}}$ represents the spread of statistical data.
- Stefan-Boltzmann Law: $P = \sigma A T^4$ where $\sigma$ is the Stefan-Boltzmann constant.
Explore Other Keyboard Tools
To type more mathematical symbols, constants, and operators, check out our collections: Math symbol keyboard, Physics constants keyboard, Chemistry formulas keyboard, Greek letters keyboard, Spanish accents keyboard, German QWERTZ keyboard, and French accents keyboard.
Frequently Asked Questions (FAQ)
What is the meaning of the Sigma symbol (Σ/σ)?
Capital Sigma (Σ) represents summation in math. Lowercase sigma (σ) represents standard deviation in statistics, mechanical stress in physics, or volatility in finance.
How do I type the Sigma symbol on a computer?
Type "\Sigma" or "\sigma" in LaTeX or MS Word. Use Alt + 228 for lowercase sigma or Alt + 229 for capital Sigma on Windows. On our tool, you can copy it or draw it.
What is the LaTeX code for Sigma?
The LaTeX command for capital Sigma is "\Sigma" and for lowercase is "\sigma".
What is the Unicode and HTML entity for Sigma?
Capital Sigma is U+03A3 (Σ), and lowercase sigma is U+03C3 (σ).