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

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OAUTH_ROOT : flickr_client
OFF : qbank_viewquestiontext\output\question_text_format
OK : core\check\result
oLocation : Sabberworm\CSS\Property\Import
ON_HEADERS : GuzzleHttp\RequestOptions
ON_STATS : GuzzleHttp\RequestOptions
ONE_CLASS_SVM : Phpml\SupportVectorMachine\Type
ONLINE_TRAINING : Phpml\Classification\Linear\Adaline
ONLYOFFICIAL : MoodleQuickForm_tags
OP_AND : core_availability\tree
OP_CONTAINS : availability_profile\condition
OP_DOES_NOT_CONTAIN : availability_profile\condition
OP_ENDS_WITH : availability_profile\condition
OP_IS_EMPTY : availability_profile\condition
OP_IS_EQUAL_TO : availability_profile\condition
OP_IS_NOT_EMPTY : availability_profile\condition
OP_NOT_AND : core_availability\tree
OP_NOT_OR : core_availability\tree
OP_OR : core_availability\tree
OP_STARTS_WITH : availability_profile\condition
OPEN : file_archive
OPENSSL_CIPHER : core\encryption
OPTION_BLOCK : core_media_manager
OPTION_FALLBACK_TO_BLANK : core_media_manager
OPTION_NO_LINK : core_media_manager
OPTION_ORIGINAL_TEXT : core_media_manager
OPTION_PREVIOUS : availability_completion\condition
OPTION_TRUSTED : core_media_manager
OPTIONPREFIX : qbank_previewquestion\question_preview_options
ORDER_INTENT_CAPTURE : paygw_paypal\paypal_helper
ORDER_STATUS_APPROVED : paygw_paypal\paypal_helper
ORIGIN_BASE : mod_bigbluebuttonbn\logger
ORIGIN_INDEX : mod_bigbluebuttonbn\logger
ORIGIN_TIMELINE : mod_bigbluebuttonbn\logger
OUT : webservice_soap\wsdl
OUTCOME_COMPLETE : core_competency\competency, core_competency\course_competency, core_competency\course_module_competency
OUTCOME_EVIDENCE : core_competency\competency, core_competency\course_competency, core_competency\course_module_competency
OUTCOME_NEGATIVE : core_analytics\calculable
OUTCOME_NEUTRAL : core_analytics\calculable
OUTCOME_NONE : core_competency\competency, core_competency\course_competency, core_competency\course_module_competency
OUTCOME_OK : core_analytics\calculable
OUTCOME_RECOMMEND : core_competency\competency, core_competency\course_competency, core_competency\course_module_competency
OUTCOME_VERY_NEGATIVE : core_analytics\calculable
OUTCOME_VERY_POSITIVE : core_analytics\calculable
OUTPUT_HTML : tool_uploadcourse_tracker
OUTPUT_PLAIN : tool_uploadcourse_tracker
OVERDUE : mod_quiz\quiz_attempt
OVERWRITE : file_archive