##  Attribute Key
Each fact sheet attribute is uniquely identified by an attribute key, also known as the technical name. These keys are crucial when setting up integrations and working with data through APIs. For more information on available APIs, see [SAP LeanIX APIs](https://help.sap.com/docs/leanix/ea/sap-leanix-apis?locale=en-US&state=PRODUCTION&version=CLOUD "Explore SAP LeanIX APIs and learn when to use each API.").
When creating custom attributes, such as fields and relations, use meaningful key names. This practice enhances readability and understanding, particularly when multiple team members or systems are interacting with the data. Note that the key name must begin with a letter.
To find the attribute key, select an attribute on the Fields tab, then view the Key value on the right-side panel.
![](https://help.sap.com/doc/72d375467c1e4dcb872dfa2998b6328d/CLOUD/en-US/loio27428fb17a441014ade5edbe65f516bb_LowRes.png)
"TIME Classification" Field and Its Key
