We called them wedges that came from Birratella's bakery. They came two to a package and were joined together, You just pulled them apart. You either got a half of a wedge or a whole wedge. In CT, they call them grinders and some places call them submarines, (not quite the same). Mom was a very good cook who was born outside of Naples in a town called Vitulazio, (now called Villa Fortuna). Dad was from Melo, (about 70 miles out of Lisbon, Portugal, (he didn't cook as he never lifted a pot or pan in his life). LOL
My grandfather landed in Younstown Ohio to stay with his brother and then moved to Yonkers, New York where all of my immediate family was born. All aunts and uncles were born in Italy. Dad's family landed in Bedford, Ma, and then he ran away to Newark, N.J. where my granfather followed him with the family. He then ran away to Yonkers where my grandfather tracked him down again so he gave up. At least thats the story I was told. All aunts and uncles were born in Portugal.
Wish I had a potato and wedge for my lunch today.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).