The 177905-1 is a 12-position, 3-row plug housing from TE's Power Double Lock series, on a 0.156" (3.96mm) pitch with a 0.181" (4.60mm) row spacing. This is a wire-to-board connector housing — it mates with a PCB header (sold separately) to distribute power across multiple circuits. The 3-row layout suits applications where board space is tight but you need more than a single-row 12-position housing can offer.
Without those terminals, the housing is just an empty shell. Compared to a single-row 6-position sibling like 1-1376477-6 (0.098" pitch), this 12-position, 3-row housing carries more circuits in a wider footprint but with a larger 3.96mm pitch that handles higher current per contact. The trade-off is board space vs current capacity.