Autunostic is a subset of -nostic. It's a gender related to warm feelings of nostalgia, sunsets, sunflowers, cool autumn breezes, autumn foliage, autumn, warmth, happiness, and sweetness.[1]
History and Flags
On 2021/8/10, Tumblr user mogai-sunflowers coined the term on Tumblr.[1] Its flag's description is A flag with nine equally-sized horizontal stripes. From top to bottom, the colors are medium brown, red-orange, light orange, lime yellow, white, baby blue, sky blue, purple, and medium purple.