Rangpurs are highly acidic and can be used as a substitute for limes.
However the name lime in connection with this fruit is misleading, because there are very few similarities between the rangpur and other fruits called limes.

In 2006, Diageo introduced a rangpur-flavored version of Tanqueray gin, known simply as Tanqueray Rangpur.

Cultivation
Citrus × limonia is cultivated as an ornamental tree for planting in gardens and a container plant on patios and terraces in the United States.
Outside the U.S. it is used principally as a citrus rootstock, except Costa Rica where it is also grown commercially and is preferred over lime and lemon.
Rangpurs are highly acidic and can be used as a substitute for limes. However the name lime in connection with this fruit is misleading, because there are very few similarities between the rangpur and other fruits called limes.
In 2006, Diageo introduced a rangpur-flavored version of Tanqueray gin, known simply as Tanqueray Rangpur.
Cultivation
Citrus × limonia is cultivated as an ornamental tree for planting in gardens and a container plant on patios and terraces in the United States. Outside the U.S. it is used principally as a citrus rootstock, except Costa Rica where it is also grown commercially and is preferred over lime and lemon.
Rangpur (fruit)