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

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MAIL_GOOGLE_COM : Google_Service_Gmail, Google_Service_Script
MAIL_MAX_LINE_LENGTH : PHPMailer\PHPMailer\PHPMailer
MAILBOX : tool_messageinbound\manager
MAILDISPLAY_COURSE_MEMBERS_ONLY : core\user
MAILDISPLAY_EVERYONE : core\user
MAILDISPLAY_HIDE : core\user
MAIN_CONTENT_TOKEN : core\output\core_renderer
MAJOR_VERSION : GuzzleHttp\ClientInterface
MANAGER_PATH : tool_licensemanager\helper
MAPSENGINE : Google_Service_MapsEngine
MAPSENGINE_READONLY : Google_Service_MapsEngine
MARK_TOLERANCE : question_utils
MATRIX_USER_PREFIX : communication_matrix\matrix_user_manager
MAX_CHARACTERS_PER_CELL : OpenSpout\Writer\XLSX\Manager\WorksheetManager
MAX_COGNITIVE_LEVEL : core_analytics\local\indicator\community_of_inquiry_activity
MAX_CONTEXT_NAME_LENGTH : core\content\export\zipwriter, core_privacy\local\request\moodle_content_writer
MAX_CSS_IMPORTS : repository_url
MAX_DISPLAYED_NAV_NODES : core\navigation\views\secondary
MAX_DP : question_display_options
MAX_FILESIZE : core\moodlenet\resource_sender
MAX_GRADES_PER_PAGE : grade_report_grader
MAX_GROUPS : qtype_ddtoimage_edit_form_base
MAX_INPUT_LENGTH : mod_bigbluebuttonbn\form\guest_add
MAX_LENGTH_SHEET_NAME : OpenSpout\Writer\Common\Manager\SheetManager
MAX_LINE_LENGTH : PHPMailer\PHPMailer\PHPMailer
MAX_MAIN_PROCESS_KEEPALIVE : core\cron
MAX_NONCE_AGE : IMSGlobal\LTI\ToolProvider\ConsumerNonce
MAX_NUM_STRINGS_PER_TEMP_FILE : OpenSpout\Reader\XLSX\Manager\SharedStringsCaching\CachingStrategyFactory
MAX_ONLY : question_display_options
MAX_PRIORITY : data_field_base
MAX_READ_BYTES_PER_LINE : OpenSpout\Reader\CSV\RowIterator
MAX_RECURSION_TIME : repository_url
MAX_RESULTS : core_question\external\search_shared_banks, core_search\manager
MAX_SETTINGS_BATCH : backup_ui_stage_schema, restore_ui_stage_schema
MAX_SHARE_KEY_LENGTH : IMSGlobal\LTI\ToolProvider\ResourceLinkShareKey
MAX_SHARE_KEY_LIFE : IMSGlobal\LTI\ToolProvider\ResourceLinkShareKey
MAX_SIZE : tool_generator_backend
MAX_SLOTS_FOR_DEFAULT_REVIEW_SHOW_ALL : mod_quiz\quiz_attempt
MAX_SOCIAL_LEVEL : core_analytics\local\indicator\community_of_inquiry_activity
MAX_SORTS : core_question\local\bank\view
MAX_STUDENTS_PER_PAGE : grade_report_grader
MAX_TIME : core_analytics\analysable
MAX_TRY_COUNTED : core_question\statistics\responses\analyser
MAX_VALUE : core_analytics\local\indicator\base
MAX_WEIGHT : block_manager
MAXIMUM_STORED_SESSION_HISTORY : core\session\manager
MCLIB : ADODB_Cache_MemCache
MEDIA_BOX : PageBoundaries
MENU_POSITION_NOT_SET : core_question\local\bank\view_component
MESSAGE_DELETED : tool_messageinbound\manager
MESSAGE_FLAGGED : tool_messageinbound\manager
MESSAGE_LENGTH_LIMIT : core_sms\gateway
MESSAGE_SEEN : tool_messageinbound\manager
METHOD_MAPPING : DI\CompiledContainer
METHOD_SODIUM : core\encryption
methods : Slim\Routing\Route
MIN_ANNOTATION_HEIGHT : assignfeedback_editpdf\pdf
MIN_ANNOTATION_WIDTH : assignfeedback_editpdf\pdf
MIN_COLUMN_WIDTH : qbank_columnsortorder\output\column_sort_ui
MIN_MEMORY_SIZE : cachestore_redis\task\ttl
MIN_POLL_INTERVAL : mod_bigbluebuttonbn\local\proxy\bigbluebutton_proxy
MIN_PRIORITY : data_field_base
MIN_SHARE_KEY_LENGTH : IMSGlobal\LTI\ToolProvider\ResourceLinkShareKey
MIN_SIZE : tool_generator_backend
MIN_SUBSET_ITEMS : qtype_ordering_question
MIN_VALUE : core_analytics\local\indicator\base
MINDIMS : workshop_accumulative_strategy, workshop_comments_strategy, workshop_numerrors_strategy, workshop_rubric_strategy
MINUTEMAX : core\task\scheduled_task
MINUTEMIN : core\task\scheduled_task
MINUTES_DURATION : PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Duration
MINUTES_LONG : PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Duration, PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Time
MINUTES_SHORT : PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Duration, PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Time
MISSING_QUESTION_CATEGORY_PLACEHOLDER : mod_quiz\structure
MOBILE_TOKEN_MAPPINGS : libphonenumber\PhoneNumberUtil
MODE_AFTER : qbank_viewcreator\timemodified_condition
MODE_ALL : core\task\logmanager
MODE_ALL_LEVELS : IMSGlobal\LTI\ToolProvider\Service\ToolSettings
MODE_APPLICATION : core_cache\store
MODE_ASYNC : backup
MODE_BEFORE : qbank_viewcreator\timemodified_condition
MODE_BETWEEN : qbank_viewcreator\timemodified_condition
MODE_CATEGORY : feedback_item_info
MODE_COPY : backup
MODE_COURSE : feedback_item_info
MODE_CREATE_ALL : tool_uploadcourse_processor
MODE_CREATE_NEW : tool_uploadcourse_processor
MODE_CREATE_OR_UPDATE : tool_uploadcourse_processor
MODE_CURRENT_LEVEL : IMSGlobal\LTI\ToolProvider\Service\ToolSettings
MODE_DISTINCT_NAMES : IMSGlobal\LTI\ToolProvider\Service\ToolSettings
MODE_EXTRACT : tgz_extractor
MODE_FAILONLY : core\task\logmanager
MODE_IMPORT : backup
MODE_LIST : tgz_extractor
MODE_LIST_COMPLETE : tgz_extractor
MODE_NONE : core\task\logmanager
MODE_REQUEST : core_cache\store
MODE_RESPONSETIME : feedback_item_info
MODE_SAMESITE : backup
MODE_SESSION : core_cache\store
MODE_UPDATE_ONLY : tool_uploadcourse_processor
MODEL_TYPE_IMAGE : aiprovider_ollama\aimodel\ollama_base, aiprovider_openai\aimodel\openai_base
MODEL_TYPE_TEXT : aiprovider_ollama\aimodel\ollama_base, aiprovider_openai\aimodel\openai_base
MODICA_DEFAULT_API : smsgateway_modica\gateway
MODIFIED_FIELD_NAME : core_search\base_activity
MODULE : mod_data\manager, mod_subsection\manager
MONITORING : Google_Service_CloudMonitoring
MONITORING_READONLY : Google_Service_Cloudlatencytest
MONTH_NAME_FULL : PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Date
MONTH_NAME_SHORT : PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Date
MONTH_NUMBER_LONG : PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Date
MONTH_NUMBER_SHORT : PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Date
MONTHMAX : core\task\scheduled_task
MONTHMIN : core\task\scheduled_task
MOODLE_APPS_PORTAL_URL : tool_mobile\api
MOVE_DOWN : core\plugininfo\base
MOVE_UP : core\plugininfo\base
MSG_ADDED : workshop_manual_allocator
MSG_SUCCESS : workshop_random_allocator
MTRACE_MSG : auth_ldap\task\asynchronous_sync_task, auth_ldap\task\sync_task
MULTIANSWER_DELIMITER : lesson_page
MULTIPART : GuzzleHttp\RequestOptions
mUrl : Sabberworm\CSS\Property\CSSNamespace