Final answer:
An exposure on the left side of a building can be designated using the clock face method, such as the "9 o'clock" position if facing the front facade, or by cardinal directions, like "west side," depending upon the building's orientation.
Step-by-step explanation:
The designation of an exposure on the left side of the building would typically be given in relation to a standardized point of reference. In the context of emergency services such as firefighting, a common system is the clock face method or the use of directional terms based on the building's orientation. For instance, if you are facing the front facade of the building (considered the "12 o'clock" position), the left side could be referred to as the "9 o'clock" position. Alternatively, cardinal directions like North, South, East, or West could be used if the building's orientation is known. In the context of describing an event or room's location within a building for emergency responders or navigation purposes, terms like "left wing" or "west side" can be utilized assuming North as the top of a map.