Bilbo's door sign, which reads "B.B.B.," stands for "Bagginses' B.B.B." or "Baggins' Bilbo Baggins." In J.R.R. Tolkien's "The Hobbit," the sign indicates that it is the home of a hobbit, specifically Bilbo Baggins, and serves as a playful invitation for guests. The sign reflects Bilbo's personality and his desire for a quiet, untroubled life, while also hinting at his adventurous spirit that is awakened throughout the story.
Because the previous morning, Gandalf had "scratched a queer sign on the hobbit's beautiful green front door" as a sign so that the dwarves would know that Bilbo was the one he had chosen to go on their adventure with them. By knocking very hard on the mark with his staff, Gandalf put a dent in the wood over top of where the sign had been, erasing any evidence that it had been there. That way, Bilbo would not blame Gandalf for all of the dwarves coming to his house to take him on an adventure.
While Bilbo was sitting and thinking, a thrush flew up with a snail. It was knocking the snail against a rock, and it prodded Bilbo to remember the riddle from the map.
They saw a stairway leading to a door.
The Hobbit tells us that the door was green, with a brass knob in the middle.
In "The Hobbit," Bilbo Baggins discovers how to open the secret door to the Lonely Mountain after much contemplation and reflection on the clues provided by the map and his surroundings. He recalls the phrase "the last light of Durin's Day," realizing that the door can only be opened at sunset on that specific day when the last rays of light illuminate the keyhole. As he shares this revelation with Thorin and the other dwarves, they eagerly gather around, and Bilbo's insight ultimately leads them to the entrance of their ancestral home. This moment highlights Bilbo's growing resourcefulness and importance to the quest.
He makes a sign on Bilbo's door that the dwarves interpret to mean "burglar for hire", which brings them into Bilbo's house.
That there is a burglar in residence looking for work.
Because the previous morning, Gandalf had "scratched a queer sign on the hobbit's beautiful green front door" as a sign so that the dwarves would know that Bilbo was the one he had chosen to go on their adventure with them. By knocking very hard on the mark with his staff, Gandalf put a dent in the wood over top of where the sign had been, erasing any evidence that it had been there. That way, Bilbo would not blame Gandalf for all of the dwarves coming to his house to take him on an adventure.
He scratches a secret sign on the door that advertises that an "Expert Burglar" lives here.
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He just uses it to write a sign on the door. It makes more sense if you continue to watch to when Thorin Oakenshield arrives and says "I would never have found this place but for the mark on the door".
He places a couple of runes. They can be seen in one of Tolkien's illustrations. They basically say that a burglar is looking for work.
While Bilbo was sitting and thinking, a thrush flew up with a snail. It was knocking the snail against a rock, and it prodded Bilbo to remember the riddle from the map.
They saw a stairway leading to a door.
The Hobbit tells us that the door was green, with a brass knob in the middle.
If you mean a door with the wisdom sign on it then you need the wisdom fairy's power to open the door.
The dwarves had begun to think Bilbo should put on his ring and scout the front door. He was getting tired of them and their expectations of him. And finally when the key-hole was revealed none of them thought to use the key! He had to shout at Thorin to get him over to the door in time.