What is Deliriums sigil?
The sigil for Delirium is a chaotic pattern. The true significance of the sigils housed in the galleries of the Endless remains uncertain. So far we’ve only seen them used as a means of communication between the Endless and a means of travel between the realms. Each gallery contains a copy of the sigils of the other six Endless. The order of the sigils seems to vary, though most seem to be in a Destiny-to-Delirium order with a few translocations. (An exception to this pattern is Destiny’s gallery. Instead of sigils, each Endless is represented by a large portrait.) In Sandman #46, when Delirium closes off her realm, her sigil in Dream’s gallery (and probably Death’s since Death mentions the change) turns black. According to Delirium, she has lost her own gallery somewhere within her realm (Sandman #41). However, she must have rediscovered it later as she uses it properly in Sandman #64.
