white stick

noun
  1. a walking stick used by a blind person for feeling the way: painted white as a sign to others that the person is blind
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012