NIPR, or the Non-Classified Internet Protocol Router Network, is a secure way for military personnel and government officials to communicate information that is not classified. Synonyms for NIPR include "unclassified network," "non-sensitive network," and "open-source network." These terms refer to a network that is accessible to individuals with the proper clearance level but does not contain information that is classified or restricted. Other synonyms for NIPR may include "low-side network" and "public-facing network." It is important to note that while NIPR is not classified, it is still subject to strict security measures and regulations to protect sensitive information.