Question

what does black ribbon means ?

Answer 1

A black ribbon is a symbol of remembrance or mourning.

Answer 2

In other point of view,

black ribbon is a symbol of an american company named black aids ..

In general we get .,

A black ribbon is a symbol of remembrance or mourning. Wearing or displaying a black ribbon has been used for POW/MIA remembrance, mourning tragedies or as a political statement.