A Digital Media Renderer (DMR) is a DLNA device, classed as a Home Network Device.
These devices can source content from other DLNA devices, in particular a Digital Media Controller. These could be anything from televisions, audio/video receivers, video displays, remote speakers and so forth.
If such a device carries a DLNA-Certified logo, then it should be compatible with other DLNA devices.
Other types of DLNA devices include...
Home Network Devices
Digital Media Server (DMS)
Digital Media Player (DMP)
Digital Media Controller (DMC)
Digital Media Printer (DMPr)
Mobile Handheld Devices
Mobile Digital Media Server (M-DMS)
Mobile Digital Media Player (M-DMP)
Mobile Digital Media Uploader (M-DMU)
Mobile Digital Media Downloader (M-DMD)
Mobile Digital Media Controller (M-DMC)
Home Infrastructure Devices
Mobile Network Connectivity Function (M-NCF)
Media Interoperability Unit (MIU)