What this pin does in the harness
It's the male half of the connection, mating with the corresponding socket contact (like 1-770834-0) inside a Mini-Universal MATE-N-LOK housing.
This pin accepts 26-30 AWG wire, which is the fine-wire end of the Mini-Universal MATE-N-LOK range. Compare that to the sibling 1-770901-0, which takes 22-26 AWG for heavier power circuits, or the 1-770903-0 handling 18-22 AWG.
Pin vs socket — getting the mating half right
This is a pin contact (male), so it mates with a socket (female) like the 1-770834-0 in the same wire gauge range. In a Mini-Universal MATE-N-LOK housing, the pin typically goes into the plug half and the socket into the receptacle, but the housing keying determines the final orientation. If you're re-pinning an existing harness on site, check which side has the pin — swapping a pin for a socket requires the other contact type.