What is the standard abbreviation for North America?

There isn't a universally recognized standard abbreviation for North America.

However, here are some commonly used options:

* NA: This is a widely used abbreviation, particularly in North American contexts.

* N. Amer.: This is a more formal abbreviation often used in writing.

* N.A.: This is another formal abbreviation, similar to "N. Amer."

Ultimately, the best abbreviation depends on the context and your audience.