Final answer:
An estoppel is a legal principle in property law that stops a party from denying or asserting anything contrary to prior conduct if it would harm another party who relied on the original conduct.
Step-by-step explanation:
An estoppel is not a plumbing fixture, trade fixture, notice to terminate tenancy, or document confirming tenants rights and landlords responsibilities. Instead, it is a principle in law that prevents a person from asserting something contrary to what is implied by a previous action or statement of that person or by a previous pertinent judicial determination. In the context of property law and landlord and tenant agreements, an estoppel can prevent a party from making assertions that are inconsistent with past conduct if another party has relied upon that conduct and was led to a disadvantage.