An eruv is a symbolic enclosure that allows observant Jews, mostly of the Orthodox community, to carry objects outdoors on the Sabbath. In ancient times, an eruv would combine multiple residences into a walled courtyard, but in modern times, rabbinic interpretation allows such an enclosure to be accomplished by creating symbolic wall or fence continuously around an area.
The Princeton Eruv uses natural features, existing fences, and utility poles to create a visually unobtrusive perimeter that meets all the necessary requirements. In limited cases utility poles will have small attachments that ensure compliance with Jewish law. It includes central Campus, Lakeside Apartments, and Stanworth Apartments. See the map which outlines the the boundary of the eruv.