Yellow ribbons are one of the awareness ribbons that stand for armed-forces return. Yellow ribbons show awareness for things including suicide awareness, amber alert, bone cancer, and spina bifida awareness.

There are a variety of awareness ribbons available to purchase and show support. The first ribbon introduced was the yellow ribbon. Other ribbons promote awareness to things such as breast cancer, military, and mourning.

Typically, animal abuse awareness.

Wikipedia has a comprehensive list of the colours of Cancer awareness ribbons, please see the related link below.

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