https://help.twitter.com/en/rules-and-policies/profile-label..."The grey checkmark indicates that an account represents a government/multilateral organization or a government/multilateral official. Eligibility criteria to receive a complimentary grey checkmark are listed below. Additional government and multilateral accounts can receive grey checkmarks through Verified Organizations.
Eligible government organizations at the national level may include: Main executive office accounts, agency accounts overseeing specific areas of policy, main embassy and consulate accounts, and parliamentary or equivalent institutional and committee accounts. Eligible government organizations at the state and local level include: Main executive office accounts and main agency accounts overseeing crisis response, public safety, law enforcement, and regulatory issues.
Eligible government individuals may include: Heads of state (presidents, monarchs and prime ministers), deputy heads of state (vice presidents, deputy prime ministers), national-level cabinet members or equivalent, the main official spokesperson for the executive branch or equivalent, and individual members of all chambers of the supranational or national congress, parliament, or equivalent.
Eligible multilateral organizations may include: the main headquarters-level, regional-level, and country-level institutional accounts. Eligible multilateral individuals include: The head and deputy-head or equivalent of the multilateral organization.
US only: Accounts of current US state governors and senior military leaders are also eligible.
Eligible accounts may apply here. (link)
Any government or multilateral accounts that do not qualify under our current grey checkmark criteria can see if they’re eligible under our Verified Organizations feature."