"PIG" does not stand for either "Pipeline Inspection Gauge" or "Pipeline Intervention Gadget" or any other such nonsense - they just look a bit like pigs, and the original ones were made of straw bals wrapped with barbed wire which made a loud squealing noise.
![Natural Gas Compressor Station Site Equipment Overview [Oil & Gas Basics]](http://i.ytimg.com/vi/vUpqGBaofGs/mqdefault.jpg)
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"PIG" does not stand for either "Pipeline Inspection Gauge" or "Pipeline Intervention Gadget" or any other such nonsense - they just look a bit like pigs, and the original ones were made of straw bals wrapped with barbed wire which made a loud squealing noise.