Etag

Etag can refer to:


 * HTTP ETag, entity tag, part of the HTTP protocol for the World Wide Web
 * etags, the ctags utility that comes with Emacs
 * NERC Tag, also known as E-Tag, a transaction on the North American bulk electricity market
 * e-TAG, an electronic tolling system used on tollways in Australia
 * European Technology Assessment Group, a network of scientific institutions
 * European Technical Approval Guidelines, drafted by the European Organisation for Technical Approvals