There have been several movements that have used the color yellow as a symbol or identifier. Some examples include:

1. The Yellow Vest movement in France, which began in 2018 as a protest against fuel tax increases and evolved into a broader anti-government movement.

2. The Umbrella Movement in Hong Kong, which began in 2014 as a protest for universal suffrage and democracy and used yellow umbrellas as a symbol of peaceful resistance.

3. The Yellow Movement in Ethiopia, which began in 2013 as a movement for gender equality and women's rights.

4. The Yellow Movement in South Korea, which began in 2016 as a protest against political corruption and used yellow ribbons as a symbol of solidarity.

These are just a few examples, but there may be others that I am not aware of.