Julietian is a duaric orientation, referring to WLM (women loving men). A julietian woman may or may not be attracted to other genders as well. It can refer to straight women, bisexual women, pansexual women, and any other women who experience attraction to men.
The term is typically not used as an orientation on its own, though it can be if desired. The term is commonly used by non-straight women to talk about their attraction to men (though straight people are included in the definition). It can also be be used as an identity for women who know they are attracted to men but are unsure if they're attracted to other genders, or by women who are attracted to multiple genders but want to emphasize their attraction to men.
The male equivalent to julietian is romeric.
The term was coined and the flag was created on June 27, 2018, in a submission to Tumblr user beyond-mogai-pride-flags. The term comes from Juliet of the Shakespeare play Romeo and Juliet.
The meaning of the original julietian flag is unknown.
The second flag was created by Reddit user Israbelle on March 2, 2021. It is based on a romeric flag that appeared to them in a dream, but the blue/pink gradient is reversed.