A participant on Boston Reddit might have the answer: Contrails from a plane that was doing circles over the Boston area - a plane owned by a company that specializes in aerial reconnaissance and surveillance.
It’s a plane flying in a fixed circle around a spot on the ground, for aerial photography, mapping, other reconnaissance. Winds aloft make it appear as multiple circles in diff places, even though it’s multiple circles in the same place.
During primary flight training you practice visual ground reference maneuvers and one is making a round circle around a point accounting for winds aloft. If winds are strong and you just turn at a constant rate you’ll trace a pattern like this instead!