Greek Art Symbol Question

[Ánleifr]

Does anyone know what the symbol is on the banner hanging from the shield? Is it an eye, bird, bird head, etc?

http://i1095.photobucket.com/albums/i461/Tuck479/TeucerAjax01.jpg

[Vasconcelos]

Eye, I think. Compare with:

http://wikiesh.wikispaces.com/file/view/trirreme3.jpg/148904025/trirreme3.jpg

[Ánleifr]

ok, thanks. Do you know what it might symbolize?