There are many Chinese terms for grandparents, and they vary from region to region. In addition, some Chinese use different names for maternal and paternal grandparents. The most commonly used name for a paternal grandmother is nai nai, but the formal term is zu mu. For maternal grandmothers, lao lao is commonly used, but wai zu mu, wai po and po po are common variations. These terms would be capitalized if used as a particular grandparent's name.