Ming Tang 明堂
Most self learn masters call it Bright Hall. This is widely accepted by non Chinese practitioners as correct. This is the disadvantage of learning feng shui from non Lineage schools.
What Most People Think?
Most people or practitioner thinks it is the open space around the main entry point of the premise. It can be further defined as the the water in front of the house . Some others say it is the open, uncluttered and clean space in front of main door. This is to ensure the energy entering the house in “uncontaminated”.