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Could you please tell me the name of the red wire connector/terminal shown in the picture?

enter image description here

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    \$\begingroup\$ To clarify - you've removed the twin-screw "chocolate block" joiner as pictured on the other wires, and found this underneath both screws, right ? \$\endgroup\$
    – Criggie
    Aug 31 at 3:11
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    \$\begingroup\$ That's a ferrule \$\endgroup\$
    – slebetman
    Aug 31 at 8:02
  • \$\begingroup\$ Are you supposed to use these things as splices/tees, by any electrical code in the world? I could see a bad, arcy chain reaction starting in case any one wire is ripped out of that crimp... \$\endgroup\$ Sep 1 at 1:02
  • \$\begingroup\$ @rackandboneman If it's the correct size and has been properly crimped, good luck pulling out a wire. (Not that that one looks properly crimped.) \$\endgroup\$
    – Sneftel
    Sep 1 at 9:25
  • \$\begingroup\$ @Sneftel I was specific to the situation of stuffing enough stranded leads into one ferrule that some of them might actually just be press-fit between other wires.... \$\endgroup\$ Sep 2 at 0:47
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That's an insulated bootlace crimp ferrule.

enter image description here

  • Insultated so that there is no touch danger when fully inserted into the terminal block. The insulation covers the funnel which guides the strands into the tubular section.
  • Bootlace because it's similar to those used to stop boot laces from fraying.
  • Crimp because a crimping tool is used to clinch the wires.
  • Ferrule /ˈfɛruːl,ˈfɛr(ə)l/ noun a ring or cap, typically a metal one, which strengthens the end of a handle, stick, or tube and prevents it from splitting or wearing.

The colour should indicate the gauge wire it matches.

Image source: Google image search random image.

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    \$\begingroup\$ Just a note: while the color indicates a wire gauge, there are multiple conflicting coloring schemes. \$\endgroup\$
    – Pelle
    Aug 31 at 8:06
  • \$\begingroup\$ @Pelle, note my use of the word "should". It was deliberate! d:^) \$\endgroup\$
    – Transistor
    Aug 31 at 8:09
  • \$\begingroup\$ Also sometimes called 'cable shoes' (mostly online) because of some confusion with the Dutch translation. I've seen them on Ali Express under that name as well. \$\endgroup\$
    – Zimano
    Aug 31 at 8:22
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    \$\begingroup\$ It's a bootlace ferrule that has been very poorly crimped with (by the looks of it) side-cutters. \$\endgroup\$
    – SiHa
    Aug 31 at 12:55
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    \$\begingroup\$ @SiHa I actually don't think so. Given the four evenly spaced dents and apparently square cross-section, it was likely crimped by a cheap four-jaw crimper similar to this one. It's deformed because it used to be screwed down (likely in that terminal block). \$\endgroup\$
    – TooTea
    Aug 31 at 14:52
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It's a wire ferrule.

'An electric wire ferrule (sometimes electric end terminal) is a metal tube crimped over stranded wire to secure the strands within a screw terminal. Electrical insulation may be included to protect any exposed portion of the wire not completely inside the screw terminal post. Stranded wire is preferred for most electrical applications because it is more reliable than solid wire. It is more flexible and durable because repeated bending will not cause it to break. Stranded wire can be more difficult to terminate, because the individual strands tend to separate after insulation is removed. By placing the end of the stranded wire in a ferrule, the strands stay together'.

Courtesy - Wikipedia.

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