Sigma
noun
The 18th letter of the Greek alphabet.
The Greek word for seven starts with the letter sigma.
Often appears as...
- greek alphabet
- lowercase sigma
noun
Symbol in mathematics representing the sum of a series of numbers.
In my math class, we learned that sigma notation is used to write out the sum of a series.
Often appears as...
- sigma notation
- sum of series
Usage tips
Technical
noun
A statistical measure in quality management.
The six sigma process aims for near-perfect results in a company's operations.
Often appears as...
- six sigma
- process improvement
Usage tips
Formal
Technical
noun
A type of bond in chemistry where electrons are shared equally.
In a sigma bond, the atomic orbitals directly overlap, creating a strong bond between atoms.
Often appears as...
- sigma bond
- molecular bond
Usage tips
Technical
noun
The 18th letter of the Greek alphabet.
The Greek word for seven starts with the letter sigma.
Often appears as...
- greek alphabet
- lowercase sigma
noun
Symbol in mathematics representing the sum of a series of numbers.
In my math class, we learned that sigma notation is used to write out the sum of a series.
Often appears as...
- sigma notation
- sum of series
Usage tips
Technical
noun
A statistical measure in quality management.
The six sigma process aims for near-perfect results in a company's operations.
Often appears as...
- six sigma
- process improvement
Usage tips
Formal
Technical
noun
A type of bond in chemistry where electrons are shared equally.
In a sigma bond, the atomic orbitals directly overlap, creating a strong bond between atoms.
Often appears as...
- sigma bond
- molecular bond
Usage tips
Technical
Definition 1 of 4
Pro Tip 1/3Language Origin
Sigma originates from Greek. Understanding Greek letters is helpful when encountering academic or scientific terms.
The symbol σ (sigma) is often used in scientific notation.
Pro Tip 2/3Visual Similarity
Lowercase sigma has two forms; one used in the middle of words (σ), and another as the final letter (ς).
The sigma at the end of 'basilicas' changes to ς.
Pro Tip 3/3Pronunciation
Sigma is pronounced as 'sig-muh'. It can help to link it with the sound in 'signal'.
Remember to pronounce the 'g' in sigma softly, like in 'signal'.
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certaintyspreadvariance
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Video examples
Daphne Koller: What...
posed what's called the 2 sigma problem, which he observed by studying three populations. The first is the population that studied in a lecture-based classroom. The second is a population of students that studied using a standard lecture-based classroom, but with a mastery-based approach, so the students couldn't move on to the next topic
Video examples
What we're learning from...
two sigma problem which he observed by studying three populations the first is the population that studied in a lecture based classroom the second is a population of students that studied using a standard lecture based classroom but with a mastery based approach so the students couldn't move on to the next
Video examples
Daphne Koller: What...
posed what's called the 2 sigma problem, which he observed by studying three populations. The first is the population that studied in a lecture-based classroom. The second is a population of students that studied using a standard lecture-based classroom, but with a mastery-based approach, so the students couldn't move on to the next topic
Video examples
What we're learning from...
two sigma problem which he observed by studying three populations the first is the population that studied in a lecture based classroom the second is a population of students that studied using a standard lecture based classroom but with a mastery based approach so the students couldn't move on to the next
Example 1 of 2
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