Five is the third factorial prime, an alternating factorial, and an Eisenstein prime with no imaginary part and real part of the form 
  
    
      
        3
        p
      
    
    {\displaystyle 3p}
   − 
  
    
      
        1
      
    
    {\displaystyle 1}
  .
The Ghubar Arabs transformed the digit in several different ways, producing from that were more similar to the digits 4 or 3 than to 5. It was from those digits that Europeans finally came up with the modern 5. While the shape of the character for the digit 5 has an ascender in most modern typefaces, in typefaces with text figures the glyph usually has a descender, as, for example, in . On the seven-segment display of a calculator, it is represented by five segments at four successive turns from top to bottom, rotating counterclockwise first, then clockwise, and vice-versa. Science
The atomic number of boron. The number of appendages on most starfish, which exhibit pentamerism. The most destructive known hurricanes rate as Category 5 on the Saffir–Simpson hurricane wind scale. The most destructive known tornadoes rate an F-5 on the Fujita scale or EF-5 on the Enhanced Fujita scale. Astronomy
Messier object M5, a magnitude 7.0 globular cluster in the constellation Serpens. The New General Catalogue object NGC 5, a magnitude 13 spiral galaxy in the constellation Andromeda. The Roman numeral V stands for dwarfs (main sequence stars) in the Yerkes spectral classification scheme. The Roman numeral V (usually) stands for the fifth-discovered satellite of a planet or minor planet (e.g. Jupiter V). There are five Lagrangian points in a two-body system. Biology
There are generally considered to be five senses. The five basic tastes are sweet, salty, sour, bitter, and umami.