LNB

Low Noise Block - the 'horn' thing fitted to the arm of your dish. This collects the signal from the satellite, according to the specified polarisation, converts it to a lower frequency so it can be sent down a wire, all for your Digibox to receive!
Found on http://www.heyrick.co.uk/ricksworld/digibox/glossary.html

LNB

Low Noise Block. The chunk you will see at the focus of your satellite TV dish, which comprises blocks to convert the Ku-band signal down to a more suitable frequency for cable transmission to your PC. Typically there will be an RF-amplifier, mixer, and dual-frequency local oscillator
Found on http://www.satsignal.eu/wxsat/glossary.htm

LNB

Low-Noise Blocker. The receiving end of a satellite dish.
Found on http://www.encyclo.co.uk/local/21058
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