DMR: Digital Mobile Radio
According to Motorola:
DMR stands for Digital Mobile Radio and is an international standard that has been defined for two-way radios. The DMR standard allows equipment developed by different manufacturers to operate together on the same network for all the functions defined within the standard. The aim of the DMR standard was to create a digital radio system with low complexity and low cost that still allows for equipment from different manufacturers to work together, allowing users to shop around rather than being locked into a proprietary system which would be costly to replace and maintain.
Three systems use DMR technology:
The MichiganOne DMR Tech Net provides a helpful comparison of the BrandMeister and TGIF systems.