Yesterday a new calculator arrived in the mail - without directions. It has two buttons I cannot figure out. One has a drawing of a house, the other shows some dollar bills. The second one is supposed to help convert other currency to dollars, but how?

We thought the house might mean "store," but it doesn't seem to do that, either before or after pressing a number. Maybe it means calculate the mortgage?

After we puzzled over this, my husband noticed (after several years) that his laptop from work has a little house on it. What can it mean?