In Pakistan, "Nana" is a term of respect and affection used to refer to:

1. Grandfather: Nana is a common word used by children to address their grandfather or elderly male relatives.
2. Elderly man: In some cases, Nana is used as a title of respect for an elderly man, similar to "Sahib" or "Mian".

In Pakistani culture, the term Nana carries a sense of love, respect, and reverence for one's elders. It's a way to show affection and deference to those who are older and wiser.