Vault 77

Vault 77 is a Vault-Tec vault.

Background
A Vault 77 jumpsuit can be found in Paradise Falls in the Capital Wasteland, alongside an audio recording of an agitated slaver, saying how it scares the others and it should be burnt, and that "he" may be back for it.

Appearances
Vault 77 is mentioned in Fallout 3.

Behind the scenes
The jumpsuit and holotape are references to the setting of the Fallout webcomic One Man, and a Crate of Puppets.