Can you name this type of orange?

If you said a navel orange, give yourself a gold star (or a navel orange, if you're feeling peckish). Navel refers to the spot in the middle of your belly where the umbilical cord was once attached. The oranges are refer to as thus because they have a dimple that resembles, well, a navel. Some more examples of navel:

How to prevent navel piercing deformity when pregnant?

Navel orange production blossoms this season

Navel gazing refers to being obsessed with oneself or solely focused on one issue, generally a minor one:

Americans are incredibly self-absorbed navel gazers.

Now it seems many thirtysomethings find themselves succumbing to existential navel-gazing. 'What did I do with my life?' these relative whippersnappers ask.

Naval on the other hand, pertains to a navy, that branch of the military that operates at sea.

The Puget Sound Naval Shipyard and Intermediate Maintenance Facility has agreed to pay $56,000 for hazardous waste violations.

IDF naval forces recently boarded the yacht "Irene."

The amount owners had to spend on repairs and naval stores fell for all vessel types, with container ships again having the largest decline.

Remember, your navel is in the center of your belly, while naval ships belong out at sea.