Heterosexual

Definitions and Usage
A heterosexual is someone who is exclusively attracted to the "opposite" sex (for example, a man exclusively attracted to women or vice versa). On its own, heterosexual is not a part of the LGBT+ community, but it can be combined with queer identities such as transgender, aromantic, or grey-Asexual.

Flags
Heterosexuality is sometimes represented by black and white stripes (such as in the heteroflexible and homoflexible flags) but it has no official "flag" since it is not considered a part of the LGBT+ community.