Neptunic or Nomascsexual is the attraction to women, feminine non-binary individuals, and neutral non-binary individuals. It can also be described as attraction to all genders except men and/or man-aligned/masculine-aligned non-binary individuals. This orientation is mostly used by non-binary individuals to describe their attraction without relying on the gender binary, but can be used by anyone. The term can be used as an identity on its own or combined with other orientations.
History and Flags
The term neptunic was coined by Tumblr user socialjusticeichigo on August 31, 2017 as a shorter term for nomascsexual. They later created the neptunic flag on September 17, 2017. The flag variant with a simplified photo of Neptune was designed by Wikia FANDOM user Elderflowerjuice on June 20, 2021.
User strwbryfemme on Twitter made an alternate neptunic flag on or before July 4, 2021. The flag was created to have a higher contrast for art, the same designer made a 4 stripe version for the same reason.  @strwbryfemme's flags should be used with caution as fawn has a history of exclusionism against m-spec lesbians. 
2 other 4-striped versions of the neptunic flag were made by FANDOM user ElderflowerJuice on July 27, 2021
The fourth alternate flag was designed by user residentperson on or before July 6, 2021. The pink to yellow colors represent the spectrum of attraction from women to nonbinary individuals.
- Archived Tumblr post on the coining of neptunic and uranic.
- Tumblr post on creating the neptunic and uranic flags.
- LGBTA Wikia Post/User Elderflowerjuice: went n snapped made some flag edits
- strwbryfemme on Twitter: Higher contrast neptunic and uranic flags
- An exclusionist flag maker - stwbryfemme's carrd
- strwbryfemme vandalizing the bi-lesbian page
- Twitter post with 4-stripe neptunic flags.
- Neptunic Wikia Page Comment