NBC NEWS: As the world become more aware and accepting of LGBTQ identities, an increasing number of people are coming out as nonbinary, which means their gender identity is neither exclusively male nor female. (Above: The Nonbinary Flag)

A Pew Research Center survey published last year found that about 1.6% of U.S. adults identify as transgender or nonbinary. Transgender means someone's gender identity, or the personal sense of their gender, differs from the sex they were assigned at birth, which is based on their external sex characteristics.

Transgender can be thought of as an umbrella term, and nonbinary exists under that, though not all nonbinary people identify as transgender. Some nonbinary people also identify with other terms that describe identities outside of the male-female binary, such as genderfluid, genderqueer or bigender.

Younger adults are more likely than older adults to be trans or nonbinary. Pew found that 5.1% of adults under 30 are trans or nonbinary, including 2% who are a trans man or trans woman and 3% who are nonbinary. (For the complete article Click Here.)