toggle

1. Also called a toggle rail, they are the boards which run across the flat, kind of like the rails, but running in between the stiles.

http://www.ia470.com/primer/shop.htm

2. Type of anchor bolt.

http://homerepair.about.com/od/inter...astening_6.htm

3. Type of lever-operated electrical switch.

http://www.positiveoffset.com/on-off-switch.htm