I like to buy the blue connector shown in the picture below to pigtail wire.
I do not know its name and could not find it at local Home Depot.
What is this type of connector called ?
pigTailConnector.jpg
 
the designer decided to use odd nmbers ony. 1,3,5, then realised that a 1 was as much use as an ashtray on a motorcycle, so he made it a 2.
 
Clearly my arithmetic is faulty in places! Basically, Timbo is correct...why link a 2 and a 3 to get a 3? etc, or a 2 and a 2 to get a 2?. If there's room, use a 3 or a 5...?
 
Definitely scotchlocks. You put a wire in each end and push down the lever to lock the connection. Other names splice Connector or Plier Tap.

usually used in vehicles 12v or 24 V.
I accidentally found this connector at local Home Depot. Here is the ads. Its name is Tap Splice connector.
Can handle up to 300 Volts, great for adding pigtails. In typical usage, one wire is long and one wire is short. The connector connects the tip of the short one to the middle of the long one. So the long wire has a few (4 to 6) inches and is connected to whatever the target is.


TapSpliceConnector.JPG
 
I’ve found more recently working on vehicles that the blue scotch lock connectors can break easily where the plastic folds over. Maybe just cheap stock from my local Halfords, which has now closed down (if you’re interested, @streamer )

As others in the UK have said, it’s not something we find in domestic wiring here, but that may be down to the fact that less and less jobs are conduit and stranded core cabling.

Out of interest, is US wiring multicore stranded? We would use 7 strand... which I don’t think would work with scotchlocks. Vehicle wiring however is multi stranded flexible.
 
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name of this connector ?
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ktnwin,
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littlespark,
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