Mu vs mu

Mu

name
  • Mu (a river in Burma) 

  • A hypothetical continent that allegedly existed in the Atlantic or Pacific Ocean. 

noun
  • μ (a mu particle) 

mu

noun
  • The 12th letter of the Modern Greek alphabet. 

  • A unit of surface area, currently equivalent two-thirds of a decare (about 666 meters squared). 

  • Nothingness; nonexistence; the illusory nature of reality. 

intj
  • Neither yes nor no. 

How often have the words Mu and mu occurred in a corpus of books? (source: Google Ngram Viewer )