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.
A potential competition merger involves one competitor buying a company that is planning to enter its market to compete (or vice versa). Such an acquisition could be harmful in two ways. For one thing, it can prevent the actual increased competition that would result from the firm's entry.