* Dadi (ਦਾਦੀ): This is the most common and general term for "grandmother" in Punjabi. It's used for both maternal and paternal grandmothers.
* Nani (ਨਾਨੀ): This refers specifically to a maternal grandmother.
* Dadi Ji (ਦਾਦੀ ਜੀ): This is a respectful way to address a grandmother. "Ji" is a respectful suffix in Punjabi.
* Nani Ji (ਨਾਨੀ ਜੀ): This is also a respectful way to address a maternal grandmother.
The best way to know which term to use is to ask the person how they prefer to be addressed. You can also ask a Punjabi speaker for guidance.