An Ear is to erect a flag up on the side of a lighting unit, with the purpose of controlling or blocking out light. Video production companies and film & documentary makers, also call this a Sider. (Grip / lighting)
EBU is the European Broadcast Union. The EBU standard means that 25 FPS time code is used by video production companies in Europe as standard. (Film & video production)
An Echo is caused by the reflection of sound waves from within a room or tunnel. An Echo is a repeating sound which can be a desired or unwanted effect, dependent on the circumstances in video production. (Sound)