PLLC, Professional Limited Liability Company: some states do not allow certain professionals to form an LLC that would limit the liability that results from the services professionals provide such as doctors, medical care; lawyers, legal advice; and accountants, accounting services; architects, architectural services; when the company formed offers the services of the professionals. Instead those states allow a PLLC or in the LLC statutes, the liability limitation only applies to the business side, such as creditors of the company, as opposed to the client/customer service side, the level of medical care, legal services, or accounting provided to clients. This is meant to maintain the higher ethical standards that these professionals have committed themselves to by becoming licensed in their profession and to prevent them from being immune (or at least limit their immunity) to malpractice suits.
sp.p. (spółka partnerska): ≈ limited liability partnership May also be denoted by the addition of i partner(zy) ("and partner(s)") to the firm's name. Can only be used for the purpose of practicing as a licensed professional listed in the appropriate provision of the Commercial Companies Code. The partners are fully liable for the partnership's debts, with the exception of debts incurred by other partners practicing their licensed profession and employees under their direction.
Corp., Inc., Corporation, Incorporated: used to denote corporations (public or otherwise). These are the only terms universally accepted by all 51 corporation chartering jurisdictions in the United States. However, in some states other suffixes may be used to identify a corporation, such as Ltd., Co./Company, or the Italian term S.p.A. (in Connecticut; see under Italy). Some states that allow the use of "Company" prohibit the use of "and Company", "and Co.", "& Company" or "& Co.". In most states sole proprietorships and partnerships may register a fictitious "doing business as" name with the word "Company" in it. For a full list of allowed designations by state, see the table below.
Maryland For Corporations: "Company", if it is not preceded by the word "and" or a symbol for the word "and"; "Corporation", "Incorporated" or "Limited" or abbreviations; for Limited liability companies: "limited liability company", "L.L.C.", "LLC", "L.C.", or "LC"; for Limited liability partnerships: "limited liability partnership", "L.L.P." or "LLP"; for Limited partnerships: "limited partnership", "L.P.", or "LP"; for Limited liability limited partnerships: "limited liability limited partnership", "L.L.L.P.", or "LLLP"; for Professional corporations: "chartered", "chtd.", "professional association", "P.A.", "professional corporation", or "P.C." Maryland Code – Corporations and Associations § 1-502