Cords, also called the Cingulum, are knotted lengths of cord worn about the waist in Wiccan practice, and they carry both a practical and a ceremonial function within the same object. Practically, a nine-foot cord is the standard tool for measuring the ritual circle's radius, a length repeated across published Wiccan sources closely enough that Gerald Gardner's Book of Shadows can be read as fixing it as a working convention rather than leaving circle size to guesswork.
Ceremonially, cords are used in binding during initiation rites and, in lineages that recognize graded degrees of initiation, are coloured to mark which degree a practitioner has reached, functioning as a visible record of standing within a coven in the same way regalia marks rank in many other initiatory systems. Gardner's Book of Shadows specifies their use in both senses, but the exact colour sequence attached to each degree and the specific knot conventions used in binding are not uniform across lineages: published Gardnerian and related sources genuinely disagree on the details, and the atlas records this as an authentic variation between traditions rather than resolving it toward either published account, since no single version has the standing to overrule the others.