The Standard Electrical Dictionary
In a telephone exchange or telegraph office a drop shutter annunciator, which falls to call the attention of the operator, notifying him that the line connected to such drop is to be connected to some other circuit.
The numerical value of calling drop in Chaldean Numerology is: 4
The numerical value of calling drop in Pythagorean Numerology is: 3
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"calling drop." Definitions.net. STANDS4 LLC, 2017. Web. 20 Nov. 2017. <http://www.definitions.net/definition/calling drop>.