n-localization property
  Let n be an integer greater than 1. A tree T is an n-ary tree provided that every node in T has at most n immediate successors. A forcing notion P has the n-localization property if every function from omega to omega in an extension via P is an omega-branch in an n-ary tree from the ground model.   In the present paper we are interested in getting the n-localization property for countable support iterations. 
Andrzej Roslanowski