The Indigo restaurant logo typically symbolizes the color indigo, which is often associated with depth, wisdom, and tranquility. The use of this color can evoke a sense of calm and sophistication, reflecting the restaurant's ambiance or culinary ethos. Additionally, the logo may incorporate design elements that represent the cuisine or concept of the restaurant, enhancing its identity and appeal to patrons.
There is no universal special logo for a restaurant that composts.
You can see the Indigo airline emblem on it's wikipedia page here.
indigo
Taco Bell is the American restaurant chain known for having a rainbow tornado as its logo. The logo is colorful and features a bell symbol at the center.
Chili's
italian
I think that you are looking for Jamba Juice (jambajuice.com)
The American restaurant with a skinless fish as its logo is Long John Silver's. This fast-food chain specializes in seafood, particularly battered and fried fish and shrimp. The logo features a stylized fish, reflecting the restaurant's focus on seafood offerings.
ARBY'S
Dunkin donuts
Ruby tuesday
Hardee's