Color symbolism is the use of color as a representation or meaning of something that is usually specific to a particular culture or society. Context, culture and time are certainly important factors to consider when thinking about color symbolism.
Definition of backpack for English Language Learners. : a bag for carrying things that has two shoulder straps and is carried on the back.
Definition of cloak for English Language Learners. : a piece of clothing that is used as a coat, that has no sleeves, and that is worn over the shoulders and attached at the neck.