Please can you confirm if the field 'Project Key' is the correct field to use if I am looking for th

[Khanyisa Mngxali]

Please can you confirm if the field 'Project Key' is the correct field to use if I am looking for the unique identifier of a project e.g. ATL for the Atlassian project. 

I have added the field Project Key into a table gadget in my dashboard but the contents are blank. 
Do you perhaps know why? Am I using the incorrect field?

[Tomas Gustavsson]

Is there a field called Project?, see the JQL query below