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.
Legally speaking, a merger requires two companies to consolidate into a new entity with a new ownership and management structure (ostensibly with members of each firm). An acquisition takes place when one company takes over all of the operational management decisions of another. The more common interpretive distinction is whether the purchase is friendly (merger) or hostile (acquisition). In practice, friendly mergers of equals do not take place very frequently.