Wintrinostic

Wintrinostic is a subset of -nostic. It's a gender related to warm feelings of nostalgia, sunsets, sunflowers, cozy winter days inside with a warm fire and hot chocolate, winter, happiness, warmth, and sweetness.

History and Flags
On 2021/8/10, Tumblr user mogai-sunflowers coined the term on Tumblr. The flag's description is A flag with nine equally-sized horizontal stripes. From top to bottom, the colors are blood red, red-orange, orange, golden yellow, white, baby blue, blue-grey, medium blue-grey, and indigo-grey.