When creating or editing a project in Procore, you might see a 'Code' field available. See Create a New Project or Update General Project Information.
The Code field can be designated as Required, Optional, or Hidden in the Company level Admin tool. See Create a Project Fieldset.
The Code field for a project is intended to be an abbreviation of a project name. For Procore's Document Management tool, the abbreviation entered in the Code field populates as the Project field for naming standards.