Package labeling is any written, electronic, or graphic communications on the packaging or on a separate but associated label. It includes certain information on the label of a product when it is distributed in specific ways. For example, labels of food products sold in retail outlets must contain information about its ingredients and nutritional value.
Symbols Used on Packages and Labels:
Many types of symbols for package labeling are nationally and internationally standardized. For consumer packaging, symbols exist for product certifications, trademarks, proof of purchase, etc. Some requirements and symbols exist to communicate aspects of consumer use and safety. Examples of environmental and recycling symbols include –  Recycling symbol, Resin identification code, Bar codes (below), Universal Product Codes, etc.