10 files declare their use of TermInterface in Zircon Profile 8

DeleteForm.php in core/modules/forum/src/Form/DeleteForm.php

Contains \Drupal\forum\Form\DeleteForm.

ForumController.php in core/modules/forum/src/Controller/ForumController.php

Contains \Drupal\forum\Controller\ForumController.

MigrateTaxonomyTermTest.php in core/modules/taxonomy/src/Tests/Migrate/d7/MigrateTaxonomyTermTest.php

Contains \Drupal\taxonomy\Tests\Migrate\d7\MigrateTaxonomyTermTest.

taxonomy.module in core/modules/taxonomy/taxonomy.module

Enables the organization of content into categories.

TaxonomyController.php in core/modules/taxonomy/src/Controller/TaxonomyController.php

Contains \Drupal\taxonomy\Controller\TaxonomyController.

TaxonomyMenu.php in modules/taxonomy_menu/src/Entity/TaxonomyMenu.php

Contains Drupal\taxonomy_menu\Entity\TaxonomyMenu.

TaxonomyMenuHelper.php in modules/taxonomy_menu/src/TaxonomyMenuHelper.php

Contains Drupal\taxonomy_menu\Controller\TaxonomyMenu.

TaxonomyRelationshipTest.php in core/modules/taxonomy/src/Tests/Views/TaxonomyRelationshipTest.php

Contains \Drupal\taxonomy\Tests\Views\TaxonomyRelationshipTest.

Term.php in core/modules/taxonomy/src/Entity/Term.php

Contains \Drupal\taxonomy\Entity\Term.

Tid.php in core/modules/taxonomy/src/Plugin/views/argument_default/Tid.php

Contains \Drupal\taxonomy\Plugin\views\argument_default\Tid.