Eruv

An eruv (Hebrew for "mixture") is a symbolic halakhic enclosure, typically wire strung between poles read as a continuous line of doorposts and lintels, that merges separate private and public spaces such as streets and sidewalks into one legal domain, permitting observant Jews to carry ordinary objects, keys, tissues, medication, and to push strollers or use canes, outdoors on the Sabbath, which the boundary would otherwise forbid. A local rabbi typically inspects and repairs the physical eruv weekly, and eruvin now encompass large sections of cities from Manhattan to Tel Aviv.