SGP is to accurately identify the nationality and regional information of entry-exit personnel in the entry card, which is convenient for relevant departments to manage and count. SGP is the international country code of Singapore, which is formulated by the International Organization for Standardization (ISO) to uniquely identify Singapore in the world.

It is an international practice to fill in the country and region code on the entry card, which can ensure the accuracy and standardization of the information. Therefore, Singapore Entry Card adopts SGP as the country code, in order to conform to international standards and practices and facilitate entry and exit management and data statistics.