.web is a generic top-level domain that will be awarded by ICANN to one of seven registry applicants. The .web TLD will be in the official root once ICANN awards the registry contract.
Historic information about .web
.web was operated as a prospective registry, not in the official root, by Image Online Design since 1995. It originated when Jon Postel, then running the top level of the Domain Name System basically single-handedly, proposed the addition of new top-level domains to be run by different registries. Since Internet tradition at the time emphasized "rough consensus and running code", Christopher Ambler, who ran Image Online Design, saw this as meaning that his company could get a new TLD into the root by starting up a functional registry for it. After asking and receiving permission from IANA to do so, IOD launched .web, a new unrestricted top level domain.
Since then IOD has tried to get their domain into the official root through several plans to admit new top-level domains. Several new-TLD plans in the late 1990s, including Postel's original proposal, failed to reach sufficient consensus among the increasingly contentious factions of the Internet to admit any new TLDs, including .web. When ICANN accepted applications for new TLDs in 2000 which resulted in the seven new domains added soon afterward, IOD's application was not approved; neither was it officially rejected, however, since all unapproved applications remain in play for possible future acceptance. A second round of new TLDs, however, was done entirely with new applications, and only for sponsored domains (generally intended for use by limited communities and run by nonprofit entities). The .web registry remains hopeful, however, that their application will eventually be approved. On May 10, 2007, ICANN announced the opening of public comments towards a new, third round of new gTLDs, a round in which IOD has not participated.
Since vector fields can be visualized as stream-lines of a stationary flow or as Faraday’s lines of force, a non-vanishing vector field in space generates a space-filling system of lines through each point, known to mathematicians as a congruence (i.e., a local foliation). Ricci’s vision filled Riemann’s n-dimensional manifold with n congruences orthogonal to each other, i.e., a local orthogonal grid.