Omnidirectional refers to the notion of existing in every direction. Omnidirectional devices include: Omnidirectional antenna, an antenna that radiates equally in all directions VHF omnidirectional range, a type of radio navigation system for aircraft Omnidirectional camera, a camera that can see all 360 degrees around it Omnidirectional treadmill, a treadmill that allows a person to walk in any direction without moving Omnidirectional microphone, a microphone that can hear from all directions Mecanum wheel, a specially designed wheel that allows movement in any direction, such as that used by many robots in the RoboCup Small Size League Wingless Electromagnetic Air Vehicle, an electrically operated vehicle that can fly in any direction