6 invocations of hook_entity_presave() in Drupal 7

comment_save in modules/comment/comment.module

Accepts a submission of new or changed comment content.

file_save in includes/file.inc

Saves a file object to the database.

node_save in modules/node/node.module

Saves changes to a node or adds a new node.

taxonomy_term_save in modules/taxonomy/taxonomy.module

Saves a term object to the database.

taxonomy_vocabulary_save in modules/taxonomy/taxonomy.module

Saves a vocabulary.

user_save in modules/user/user.module

Save changes to a user account or add a new user.