A legal entity is anyone or anything the law recognizes as a legal actor.
In addition to human beings, entities include corporations, partnerships,
limited liability companies (LLCs), trusts, estates, government agencies,
and many other types - pdf 
Legal entities do not include ships, animals, trees, trademarks, or corporate groups, to name just a few (US Law).
Legal entities can own property, enter into contracts, sue, and be sued.
An entity is “algorithmic” if an algorithm controls it. An algorithm is a set of decision-making rules. The relevant algorithms run on computers.
They are programs (artificial intelligences) that make and execute decisions in response to external circumstances. Algorithms are not entities; they are property.
For the purposes of this Article, an algorithm controls an entity only if the algorithm makes the entity’s decisions without human participation. That a human created the algorithm does not disqualify the algorithm from status as a controller, provided that the human no longer has the ability to modify the algorithm