number off

verb
  1. (adverb) to call out or cause to call out one's number or place in a sequence, esp in a rank of soldiersthe sergeant numbered his men off from the right
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