What does CE, PE, P, LSP, LSR mean in a MPLS environment? kindly describe each one in brief.

CE = customer edge normally unaware of mpls labeling 

PE = provider edge is the egress and ingress for the mpls domain , it remove labels before sending them to CE and add labels to traffic received from CE

P = provider , mpls devices int the core of the mpls domain , forward traffic based on labels

LSP = Label Switch path , the path the labeled packet will take

LSR = Label switch router , a device that is aware of mpls labeling