The diagonal and vertical forms of the ellipsis are particularly useful for showing missing terms in matrices, such as the size-n identity matrix:

  
    
      
        
          I
          
            n
          
        
        =
        
          
            [
            
              
                
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                  ⋯
                
                
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                  0
                
                
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                  ⋯
                
                
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                  ⋱
                
                
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                  ⋯
                
                
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            ]
          
        
      
    
    {\displaystyle I_{n}={\begin{bmatrix}1&0&\cdots &0\\0&1&\cdots &0\\\vdots &\vdots &\ddots &\vdots \\0&0&\cdots &1\end{bmatrix}}}

Computer science
Programming languages
A two- or three-dot ellipsis is used as an operator in some programming languages.
The ellipsis ... (, also known informally as dot dot dot) is a series of dots that indicates an intentional omission of a word, sentence, or whole section from a text without altering its original meaning. The plural is ellipses. The term originates from the Ancient Greek: ἔλλειψις, élleipsis meaning leave out.Opinions differ as to how to render ellipses in printed material. According to The Chicago Manual of Style, it should consist of three periods, each separated from its neighbor by a non-breaking space: . . .. According to the AP Stylebook, the periods should be rendered with no space between them: .... A third option is to use the Unicode character U+2026 … HORIZONTAL ELLIPSIS. Background
The ellipsis is also called a suspension point, points of ellipsis, periods of ellipsis, or (colloquially) "dot-dot-dot". Depending on their context and placement in a sentence, ellipses can indicate an unfinished thought, a leading statement, a slight pause, an echoing voice, or a nervous or awkward silence. Aposiopesis is the use of an ellipsis to trail off into silence—for example: "But I thought he was..." When placed at the end of a sentence, an ellipsis may be used to suggest melancholy or longing.The most common forms of an ellipsis include a row of three periods or full points ... or a precomposed triple-dot glyph, the horizontal ellipsis …. Style guides often have their own rules governing the use of ellipses.