Query about the product derived from offset tracking

Hello everyone, I wanted to the derive the velocity of glaciers in Himalayas. In the screenshot you see the velocity products, the highlighted i.e. 8th product is the original velocity file and the file below that (9th) is the file after terrain correcting it. So in this the file name ends with VH but I used VV polarization, can anyone tell why does that VH occurs at the end of that file name?
Thank you