Skoliosexuality is the sexual attraction towards transgender and Non-binary people. Or Anyone who is identified as a different gender than assigned at birth(skoliosexuality is to be attracted to anyone who isn't cis-gendered). Skoliosexual is a relatively new term that refers to people who are attracted to people who are transgender or nonbinary so you probably haven't heard about it much.
The yellow represents the non-binary genders or being attracted to non-binary people. Green represents gender-queer, third gender, bigender, or other gendered individuals. The white and black represent gender-less, agender, neutral gender or questioning gender individuals, and the lavender heart represents love outside of gender forms.