The Menu is the UI the player uses and allows access to various options. The android characters seem to also acknowledge the menu and reference it, such as when the player changes the sound vaules as instructed by 9S and 2B reacts.

List of Menu Options Edit

Test Map
Map A list of zones to explore.
Test quest
Quests A list of quests and side activities to complete.
Item A list of items the to use and collect.
Weapons A list of weapons used to destroy enemies.
Skills A list of obtainable skills and upgrades.
Intel A list of detailed statistics and collectable information.