Final answer:
The yellow sign with a black outline shaped like a sideways triangle is a yield sign. This sign is used to indicate that drivers must give the right-of-way to other vehicles or pedestrians.
Step-by-step explanation:
The yellow sign with a black outline shaped like a sideways triangle is a yield sign. This sign is used in transportation to indicate that drivers must give the right-of-way to other vehicles or pedestrians. It is typically placed at intersections or other areas where traffic needs to merge or yield to oncoming traffic. It is important for drivers to be aware of and follow yield signs to ensure safe and orderly traffic flow.