Purchase of a Business » used between the Seller of business and a potential Buyer of a business. Eventually, you would use a Business Purchase Agreement to complete the deal. Purchase of Real Estate » used between the Seller of real property and a potential Buyer of the real property. You would use a Real Estate Purchase Agreement to complete the deal. Purchase of General Property » used between the Seller of personal property, such as a car or jewelry, and a potential Buyer of the personal property. You would use a Personal Property Purchase Agreement to complete the deal. Other Transaction » used between parties to document a potential transaction, such as providing goods or services over a given period of time.
Spoiler alert: a letter of intent is not the same as a cover letter. They're similar (being letters and all, and focused on yourself), but are actually used in different situations. Your cover letter is what you write when you're applying to a specific job you found through traditional channels (online job search, referral, recruiter). It details why you're a great fit for this particular job. A letter of intent is what you write when you're cold-calling (leaving a resume without being solicited for one), or applying for a job in a more general situation, like a job fair or submitting your resume to a general pool. The letter of intent is similar in that you're selling yourself, but tends to be less granular about a particular position. Letters of intent are often more networking-related, or aspirational, than position-oriented. Because you may have fewer specifics in hand about what you're applying for and who will be reading your application package, it's likely you won't have the most personalized opener. That's okay! Be general, but professional, formal, and polite.