In dimensions 
  
    
      
        n
      
    
    {\displaystyle n}
   ⩾ 9, the only three uniform polytope families, aside from the numerous infinite proprismatic families, are the 
  
    
      
        
          
            A
          
          
            n
          
        
      
    
    {\displaystyle \mathrm {A} _{n}}
   simplex, 
  
    
      
        
          
            B
          
          
            n
          
        
      
    
    {\displaystyle \mathrm {B} _{n}}
   cubic, and 
  
    
      
        
          
            D
          
          
            n
          
        
      
    
    {\displaystyle \mathrm {D} _{n}}
   demihypercubic families.
Esoteric tradition
The Theosophical Society has three conditions of membership. Gurdjieffs Three Centers and the Law of Three. Liber AL vel Legis, the central scripture of the religion of Thelema, consists of three chapters, corresponding to three divine narrators respectively: Nuit, Hadit and Ra-Hoor-Khuit. The Triple Greatness of Hermes Trismegistus is an important theme in Hermeticism. As a lucky or unlucky number
Three (三, formal writing: 叁, pinyin sān, Cantonese: saam1) is considered a good number in Chinese culture because it sounds like the word "alive" (生 pinyin shēng, Cantonese: saang1), compared to four (四, pinyin: sì, Cantonese: sei1), which sounds like the word "death" (死 pinyin sǐ, Cantonese: sei2). Counting to three is common in situations where a group of people wish to perform an action in synchrony: Now, on the count of three, everybody pull! Assuming the counter is proceeding at a uniform rate, the first two counts are necessary to establish the rate, and the count of "three" is predicted based on the timing of the "one" and "two" before it. Three is likely used instead of some other number because it requires the minimal amount counts while setting a rate. There is another superstition that it is unlucky to take a third light, that is, to be the third person to light a cigarette from the same match or lighter.