Someone shared notes, a Look or a list with you through Glaze. To open it, copy this page's address and paste it into Glaze under Shared. If Glaze is installed and set to use this server, it offers to open it here.
What's shared is encrypted. Its key is the part of the address after #, which browsers don't send to servers. This page runs no scripts. Your browser may keep the whole address, key included, in its history; pasting the link into Glaze instead of opening it avoids that.