Eye of Ender

A portal to The End had eye-like objects in it. (WC: Doctor Who Comes to MINECRAFT!)

Behind the scenes
Although the eyes went unnamed in WC: Doctor Who Comes to MINECRAFT!, they were known in Minecraft as Eyes of Ender. They were crafted by combining Ender Pearls with Blaze Powder, and were used to locate strongholds and fill in End portals.