Diesel Locomotive Wire (DLO), possibly. DLO wire has extremely fine strands. Or perhaps MTW (Machine Tool Wiring), as that also has fine strand patterns.
Generally, most lugs are rated for Class B and Class C stranding as a standard, and this is how most THWN-2 and XHHW-2 wire is made, which is the most common types used in building wiring. Class B is the minimum quantity of strands possible (7-strands in wires #2 and smaller), and class C is one up in number of circles of strands (19 strands in #2 and smaller). 7 and 19 are the extreme cases of greatest packing factor for circle packing in a circle, which are selected as strategy for stranded wiring. The next one up is 37, followed by 61.
Lugs also carry a temperature rating, in conjunction with the equipment to which they are connected. 75C is the most common, which means you need 75C wire sized at least to meet the 75C column of the ampacity table. 75C is the default for over 100A, and for 100A and less, there is a burden of proof to use greater than 60C. There are some devices, like breakers, which need to carry a slash rating for their terminations of "60/75C" if you had a desire to use 60C rated wire with 60C sizing. If equipment is straight-rated for 75C, you need to use 75C or greater wire in all cases. 60C wiring is very uncommon, as most wire available today is rated for 90C.
