|Well, congrats. You discovered it. You get to name it.|
Although this article is based on canonical information, the actual name of this subject is conjectural.
The Unplottable Place Accessing Spell was used by Cuthbert Sinclair, and later by Sam (accompanied by Crowley) to access Cuthbert Sinclair's secret hideout. Because Cuthbert Sinclair's secret hideout was heavily warded and rendered it invisible and intangible, this place was made unplottable. To access such a place, a particular spell was required to access it.
The user of this spell took some unknown ingredients to be mixed in a bowl, and recited the spell. The spell was in Latin:
- Ingressum domi dona mihi