The International Code of Signals is a universally followed standardized classification of signals and codes that vessels use for communicating with one another on navigational safety and other related issues. These codes are a systematic progression of the different maritime flag signaling methods used during the earlier times.

International shipping containers serve as crucial components of global trade, operating within a network of vessels navigating international waters. However, beyond their primary purpose, these containers offer immense potential for domestic use, serving as cost-effective solutions for various logistical challenges. International shipping containers can be considered as an extension of a ship which is expected to sail on international waters again within a specified time (usually 6 months). In India, if containers are intended for use within the country, they must be domesticated by paying import duty.