Science, Technology, Computing and Communications
- Carrier-to-noise ratio (C/N)
- CNR (imaging), the quantity "Contrast to Noise Ratio" in diagnostic imaging
- Cisco Network Registrar, a DHCP, DNS and TFTP server suite offered by Cisco
- Communications and Networking Riser (a PC motherboard card specification)
- Combat-net radio
- CNR (software), formerly known as One-Click & Run, a software service from Linspire GNU/Linux distributor
- "Could Not Reproduce", a status when debugging a software bug
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