What is 5r in Logistics ?

The 5 (Five) R's are related to the Reverse Logistics. 

Though the commonly known streamlined (Five) 5 R's in Reverse Logistics:-

1) Repairs

2) Repacking

3) Returns

4) Recalls

5) & Recycling or you can say Disposition. 

However, if you dive more into a detailed version of the same, one can say that there are more than (Five) 5 R's to Reverse Logistics like Receiving, Recovering, Reconditioning, Re-boxing, Resale etc.