For the internal and external data user who needs to understand and connect data, Symbology is a linked data service that allows data mapping and navigation across the LSEG information model to enable easier access to data and building of new data workflows.

The Discovery Symbology API is a request/response service and is part of the LSEG Delivery Platform, it is a service to assist users with concordance, navigation and discovery of content. The API enables customers to map from external identifiers to a LSEG PermID and to navigate between a wide range of identifiers.

• Map – mapping from an identifier to the corresponding PermID for that entity. For example, mapping an ISIN to an Issue PermID, or mapping a Legal Entity Identifier (LEI) to an Organization PermID. 
• Navigate – navigating between user selected start and end point identifiers (e.g. RIC to ISIN). These start and end points can be at the same or different levels with the hierarchical entity structure i.e. organization, instrument, quote. Entities at different levels in this hierarchy are linked together through relationships enabling users to navigate up and down the structure. Relationships do not need to be specified by the user in this version of the API.

The Discovery Symbology API supports a wide range of market and LSEG entity identifiers across multiple asset classes. A full list of the supported identifiers can be found in the Appendix A and via identifier endpoint described later in the document.

The service is available at no additional cost to all customers subscribing to content services through the LSEG Delivery Platform, it is not available on a stand-alone basis.

To get started, visit the Delivery Platform APIs for instructions on how to access the platform services. In addition, the “Documentation” tab on this page includes a guide that provides details on the Symbology API working environment and supporting resources. It is intended for software engineers and users of the data platform who are familiar with the general principles of APIs.