The title "Srinagarindra" was known formally as "Somdet Phra Srinagarindra Boromarajajonani", which means "Her Royal Highness Princess Mother Srinagarindra". It is a title given to the mother of the reigning king of Thailand, in this case, the mother of King Bhumibol Adulyadej.
Unveiling Srinagarindra: The Extraordinary Journey of the Mother of King Bhumibol