Electronic Voice Phenomenon (EVP) :
Electronic voice phenomenon is a term used to refer to sounds or voices that are captured on recorded media or other electronic devices that are not heard at the time of recording. Sometimes these can answer questions that are asked. This is an intelligent type of interaction. Most EVP's are residual. There is nothing intelligent about them and will happen if you are there or not.
An orb is a ball of energy that can be seen of film. This does not mean it's a ghost or that the place is haunted but it can show energy that is drawn to help a ghost manifest. Orbs are completely round, usually change direction, are completely solid, emit their own light and are not usually found after something in the room moves. As said before we do not consider orbs proof of paranormal activity.
Electro Magnetic Field (EMF) Meter:
The EMF Meter originally used to locate electrical current in walls by contractors is now used by paranormal investigators too.
The meter has been calibrated to ignore the extremely subtle EMF emissions surrounding the human body, yet is still sensitive enough to detect the small, distinct, erratic EMF energy fluctuations frequently found at reputed haunted locations.
spector, disembodied spirit A visual appearance of any spirit, or entity that doesn’t necessarily take on the shape of a human form nor does it show signs of intelligence. Usually they are translucent resembling human form.