If you have children under 10 years old you’re likely to be familiar with the mythical animal called unicorn, a horse with a single straight horn projecting from its forehead.
Due to its mythical nature, the word is also a euphemism for something that is highly desirable but difficult to obtain, like driving on either Kiambu Road or Langata Road at 7 a.m. on a weekday morning in February and finding zero traffic.