Here is a list of all documented variables with links to the class documentation for each member:

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PAGE_IMAGE_FILEAREA : assignfeedback_editpdf\document_services
PAGE_IMAGE_READONLY_FILEAREA : assignfeedback_editpdf\document_services
PAGE_LOAD_DETECTION_STRING : behat_general
PAGE_READY_JS : behat_session_interface
PAGESIZE_DEFAULT : mod_forum\local\vaults\discussion_list
PAGEVAR : course_enrolment_table
PAGINATION_OPTIONS : grade_report_grader
PARAM_FILES : question_attempt
PARAM_MARK : question_attempt
PARAM_RAW_FILES : question_attempt
PARTIAL_PDF_FILEAREA : assignfeedback_editpdf\document_services
parts : OpenSpout\Common\Entity\Style\Border
PASS : mod_h5pactivity\output\result
PENDING : tool_brickfield\registration
PERPAGE : tool_customlang_translator
PERPAGEVAR : course_enrolment_table
PHASE_SETUP : workshop
PLACEHODLER_REGEX : qtype_calculated
PLACEHOLDER : core_media_player
PLACEHOLDER_REGEX_PART : qtype_calculated
PLAIN : qbank_viewquestiontext\output\question_text_format
PLAYMOVIES_PARTNER_READONLY : Google_Service_Playmoviespartner
PLUGIN_SOURCE_EXTENSION : core_plugin_manager
PLUGIN_SOURCE_STANDARD : core_plugin_manager
PLUGIN_STATUS_DELETE : core_plugin_manager
PLUGIN_STATUS_DOWNGRADE : core_plugin_manager
PLUGIN_STATUS_MISSING : core_plugin_manager
PLUGIN_STATUS_NEW : core_plugin_manager
PLUGIN_STATUS_NODB : core_plugin_manager
PLUGIN_STATUS_UPGRADE : core_plugin_manager
PLUGIN_STATUS_UPTODATE : core_plugin_manager
PLUGINFILE : core_h5p_generator
PLUGINNAME : mod_data\manager, qbank_managecategories\helper, tool_brickfield\manager
PLUS_CIRCLES_READ : Google_Service_PlusDomains
PLUS_CIRCLES_WRITE : Google_Service_PlusDomains
PLUS_LOGIN : Google_Service_Games, Google_Service_GamesManagement, Google_Service_Oauth2, Google_Service_Plus, Google_Service_PlusDomains
PLUS_ME : Google_Service_Oauth2, Google_Service_Plus, Google_Service_PlusDomains
PLUS_MEDIA_UPLOAD : Google_Service_PlusDomains
PLUS_PROFILES_READ : Google_Service_PlusDomains
PLUS_STREAM_READ : Google_Service_PlusDomains
PLUS_STREAM_WRITE : Google_Service_PlusDomains
POLYNOMIAL : Phpml\SupportVectorMachine\Kernel
PORT : webservice_soap\wsdl
POS_BOTTOM : core\chart_axis
POS_DEFAULT : core\chart_axis
POS_LEFT : core\chart_axis
POS_RIGHT : core\chart_axis
POS_TOP : core\chart_axis
POSITION : core\output\local\dropdown\dialog
POSSIBLE_REMOTE_META_SOURCE : mod_bigbluebuttonbn\recording
POWER_LEVEL_DEFAULT : communication_matrix\matrix_constants
POWER_LEVEL_MAXIMUM : communication_matrix\matrix_constants
POWER_LEVEL_MODERATOR : communication_matrix\matrix_constants
POWER_LEVEL_MOODLE_MODERATOR : communication_matrix\matrix_constants
POWER_LEVEL_MOODLE_SITE_ADMIN : communication_matrix\matrix_constants
PREDICTION : Google_Service_Prediction
PREF_REQUEST_FILTERS : tool_dataprivacy\local\helper
PREF_REQUEST_PERPAGE : tool_dataprivacy\local\helper
PREFIX_MAX_LENGTH : xmldb_table
PRESERVING_NORMALIZATIONS : GuzzleHttp\Psr7\UriNormalizer
PREVIEWCOLUMNSLIMIT : mod_feedback_responses_table
PROFILE_FIELD_PREFIX : core_user\fields
PROFILE_FIELD_REGEX : core_user\fields
PROFILE_IMAGE_UPDATE_FAILED : enrol_lti\helper
PROFILE_IMAGE_UPDATE_SUCCESSFUL : enrol_lti\helper
PROGRESS : GuzzleHttp\RequestOptions
PROGRESS_EXECUTED : base_ui
PROGRESS_INTIAL : base_ui
PROGRESS_MAX : tgz_packer
PROGRESS_PROCESSED : base_ui
PROGRESS_SAVED : base_ui
PROVIDER_ACTIVE : core_communication\processor
PROVIDER_INACTIVE : core_communication\processor
PROVIDER_NONE : core_communication\processor
PROVISIONING_MODE_AUTO_ONLY : auth_plugin_lti
PROVISIONING_MODE_PROMPT_EXISTING_ONLY : auth_plugin_lti
PROVISIONING_MODE_PROMPT_NEW_EXISTING : auth_plugin_lti
PROXY : GuzzleHttp\RequestOptions
PUBSUB : Google_Service_Pubsub
PURPOSE_IDENTITY : core_user\fields
PURPOSE_NAME : core_user\fields
PURPOSE_USERPIC : core_user\fields