1) Programming language 2) Telephone unit 
[programming language] Erlang (ŋ {respell|ER|lang}) is a general-purpose concurrent, garbage-collected programming language and runtime system. The sequential subset of Erlang is a functional language, with eager evaluation, single assignment, and dynamic typing. It was designed by Ericsson to support distributed, fault-tolerant, soft-real...[unit] The erlang (symbol E) is a dimensionless unit that is used in telephony as a measure of offered load or carried load on service-providing elements such as telephone circuits or telephone switching equipment. For example, a single cord circuit has the capacity to be used for 60 minutes in one hour. If one hundred six-minute calls are ...
One hour of telephone traffic in an hour of time. For example, if circuits carry 120 minutes of traffic in an hour, that's two Erlangs.
a unit of traffic intensity corresponding to the occupancy of one resource
A unit of phone traffic intensity. 1erlang º one line occupied solidly for one hour º to 36 Hundred Call Seconds. See HCS.
Measure of traffic capacity of telecommunications networks. Calculated as rate at which calls arrive divided by the rate at which they are completed. An erlang is effectively the capacity to carry one phone call.
[n] - a unit of traffic intensity in a telephone system
noun a unit of traffic intensity in a telephone system