Term Kind Topic What it is
Logical Shard Virtual Shard, Shard Slot pattern Sharding Patterns A unit of partitioned data that routing targets by name rather than by machine, so data can be moved between physical hosts without changing how anything is addressed.
Sharding Patterns Horizontal Partitioning pattern Sharding Patterns Splitting data across independent stores by a key, and the choice of that key — which is the decision that will define the system for years.