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 deal may be euphemistically called a merger of equals if both CEOs agree that joining together is in the best interest of both of their companies, while when the deal is unfriendly (that is, when the management of the target company opposes the deal) it may be regarded as an acquisition.