What is "singhai"

Singhai (also Sanghvi or Singhi from Sanskrit Sanghapati (संघपति), literally chief of the Sangha) is a hereditary title awarded in the past to leaders of the Jain Sangha.

Among the Digambara Jains the title is awarded for building a Jain temple with formal installation ( Panch-kalyanak Pratishtha) of Tirthankara images with festivities, often accompanied with a gajrath. Among the Shvetambar Jains it is awarded for conducting a mass pilgrimage to major tirthas.