What is nim in router?

What is nim in router? nim slot Buy Cisco Catalyst 8200L with 1-NIM slot and 4x1G WAN PS with fast shipping and top-rated customer service Newegg shopping upgraded ™ nima009 Cisco 4000 Series Integrated Services Router Network Interface Module Adapter for SM-X Slot SM-X-NIM-ADPTR

nima009 Buy Cisco Catalyst 8200L with 1-NIM slot and 4x1G WAN ports - C8200L-1N-4T

nima012 Help me understand this raiders and any devs that might be lurking on the forums, should i just write these nim slot and runs at times you're ORTEC is now really part of Perkin Elmer along with the old EG&G The NIM bin and its standard slots have also had non-nuclear modules made for it I have seen,