Been watching the extended blu-ray version of LotR and I noticed this symbol on the back cover. Don't think I've seen this whilst watching the films, anyone know what it represents?
It's a depiction of the badge of the House of Elrond from the LotR films.
This art piece depicting the badge comes from Weta Workshop designer Daniel Falconer.
Image courtesy of The Lord of the Rings: The Art of The Fellowship of the Ring
ELVEN INSIGNIA - Daniel Falconer
These badges were used to represent the various Elven armies that might appear in the Second Age sequences. Gil-galad's was a slight reworking of the one Tolkien himself created, and similarly the Houses of both Elrond and Galadriel borrowed elements from his concepts for their respective fathers, Eärendil and Finarfin.
The other designs were entirely Dan's inventions, although clearly in keeping with the others. The designs were intended to appear on the breasts of the Elres' armor and were also incorporated by the art department for use in their Elven banners.
They're designed after the fashion of Tolkien's Elven insignia, but the overall shapes are wrong- The badge for an Elvish house is supposed to be in the shape of a square. Personal badges are a bit different. A man's badge is in the shape of a lozenge (a square tipped 45 degrees on its side), and a woman's badge is circular. The badge they made for Galadriel is almost accurate, but as they intended for it to represent her army rather than Galadriel herself, it should be in the shape of a square.