where did you get the text book from?

https://en.wikipedia.org/wiki/Na_Tuk_Kong

Na Tuk Kong are local guardian spirits worshipped in Malaysia, Singapore and parts of Indonesia, especially Sumatra. An alternate more generic name for the cult is Datuk Gong, uniting Dato or Datuk from the local Malay word for 'grandfather', which is also used as an honorific title, and Kong or Gong from Chinese, also an honorific title. It is important to note that Datuk Keramat, Datuk Gong and Na Tuk Kong all refer to the same deity. For the sake of clarity, the term Datuk, which is universally used to describe the spirit in Malaysia, will be used.