Gravity Gun

Gravity Gun trivia questions

1. In Half-Life 2 (2004), what is the Gravity Gun's formal in-universe name?
2. In Half-Life 2 (2004), who is the playable character that uses the Gravity Gun?
3. In Half-Life 2 (2004), what was the device originally designed for handling?
4. In Half-Life 2 (2004), which resistance group mostly uses it for heavy lifting?
5. In Half-Life 2 (2004), besides combat, what is a key practical use of the device?
6. In Half-Life 2 (2004), what sort of later game tools did it inspire?