Ideations are a visualization of a suicide effort...for me, it was like a 15 second video clip, sometimes in the 1st person, sometimes in the 3rd...
*TRIGGER* (hit "quote" to read)
Sitting there, putting a gun to my temple/chin/chest, pulling the trigger, brains and blood splattering against the wall....putting a gun to my temple/chin/chest, pulling the trigger, brains and blood splattering against the wall...etc. (This would last for a few minutes to an hour+ )
The thoughts/visualizations would be very intrusive, I couldn't shut them off, and after awhile I would feel as if I were actually dying.
An "attempt" is just that...like you said, a noose around the neck, swallowing pills, gun in hand, finger on the edge of pulling the trigger, etc.