Microsoft Azure Spatial Anchors Service
Anchor: a kind of data structure in AR field, which represents a precise point of interest in 3D space that can be shared across users, devices, and time
Microsoft Azure Spatial Anchors is a service that can store the local world anchors to the cloud and share the anchors among different platforms, see the table blow. ASA (Azure Spatial Anchors) enables building apps that can map, persist, and share 3D content from room-scale to real world-scale.