I've seen a lot of things crop up talking about "policy measures" recently. I've even caught myself about to use (or misuse) it . But does it mean anything unique, or is it just a redundant way of saying "policies"?
"Policy" is the principles you apply to a situation. A "policy measure" is something you do to implement that policy.
It is the policy of StackExchange to make it easy to ask questions.
A policy measure is to make the reputation threshold for asking questions zero.