mil vs ml

mil

noun
  • An angular mil, a unit of angular measurement equal to ¹⁄₆₄₀₀ of a complete circle. At 1000 metres one mil subtends about one metre (0.98 m). Also ¹⁄₆₀₀₀ and ¹⁄₆₃₀₀ are used in other countries. 

  • A unit of measurement equal to ¹⁄₁₀₀₀ of an inch (25.4 µm), usually used for thin objects, such as sheets of plastic. 

  • a former subdivision (¹⁄₁₀₀₀) of the Maltese lira 

ml

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