1 Hourglass: Torso and hips are approximately the same width - with waist definition.  Apple: Torso and upper body wider than your hips - with little or no waist definition. You might have weight surrounding your waist.
From a legal point of view, a merger is a legal consolidation of two entities into one entity, whereas an acquisition occurs when one entity takes ownership of another entity's stock, equity interests or assets.
Mergers realize synergies by building on small successes. For example, reducing some of the administrative overlap could generate immediate savings, which would show stakeholders initial benefits. Management can build on these initial successes to set aggressive targets for reducing costs and driving sales.