1.
stapler
A device for fastening papers together with metal staples.
ホッチキス is the common Japanese word for "stapler." An example of a brand name becoming a generic term.
Etymology
Named after the E.H. Hotchkiss company that sold staplers in Japan. Similar to how "Xerox" means "photocopy" in some languages.
Common expressions
Similar words
ステープラー is the technical/formal term, but ホッチキス is far more common in everyday speech.