A lien intended to prevent the sale of property until litigation concludes is termed:

A lien intended to prevent the sale of property until litigation concludes is referred to as an attachment lien. This type of lien is a legal tool that allows a creditor to secure an interest in a debtor's property while a court case is ongoing. It effectively freezes the property to ensure that it cannot be sold or transferred, thus protecting the creditor’s potential claim in the event that they win the lawsuit.

In legal terms, attachment liens are part of the process where a court orders that property be ‘attached’ or held until the outcome of the litigation is determined. This ensures that there are assets available for satisfying any judgment that may be rendered in favor of the creditor.

Other types of liens, such as a vendee's lien, mechanics lien, and mortgage lien, serve different purposes and do not specifically prevent the sale of property pending litigation. A vendee's lien might protect a buyer's interest in a property prior to the completion of a sale, a mechanics lien allows contractors and suppliers to claim a lien against a property for unpaid work, and a mortgage lien is a security interest in the property itself to secure a loan. These distinctions illustrate why attachment lien is the correct answer in the context of the question.