The erlang is a unit of traffic density in a telecommunications system. One
  erlang is the equivalent of one call (including call attempts and holding
  time) in a specific channel for 3600 seconds in an hour. The 3600 seconds
  need not be, and generally are not, in a contiguous block.

<http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212073,00.html>

p.s.  Forgot the 2nd term:

chip: ... 3. The most elemental component of a spread spectrum signal when it
is decompressed in time; that is, the longest duration signal in which signal
parameters are approximately constant.. ...
<http://www.its.bldrdoc.gov/fs-1037/dir-007/_0951.htm>

chip rate: ... 2. In direct-sequence-modulation spread-spectrum systems, the
rate at which the information signal bits are transmitted as a pseudorandom
sequence of chips. Note: The chip rate is usually several times the
information bit rate.
<http://www.its.bldrdoc.gov/fs-1037/dir-007/_0952.htm>