jack: (Default)
http://en.wikipedia.org/wiki/Five_by_five

In voice procedure (the techniques used to facilitate spoken communication over two-way radios) a station may request a report on the quality and strength of signal they are broadcasting. In the military of the NATO countries, and other organizations, the signal quality is reported on two scales; ... for signal strength, and ... signal clarity. Both these scales range from one to five, ... The listening station reports these numbers separated with the word "by".

Five by five therefore means a signal that has excellent strength and perfect clarity — the most understandable signal possible. Five by five by extension has come to mean "I understand you perfectly" ...

The term "five by five" was popularized by the character Faith in
Buffy the Vampire Slayer. Faith Lehane used it frequently ... meaning that things were good.

(Someone was asking me what this means. Here, suckle at the informational teat :) There isn't a citation, so I don't know for sure this is completely correct, but I'm sure it's why she says it.)