ECR stands for "Electronic Cash Register," which is a device used for calculating and recording sales transactions. Some synonyms for ECR include POS terminal, cash register, point of sale system, checkout system, and sales terminal. A POS (Point of Sale) terminal is a computerized system that manages retail sales transactions and inventory management. A cash register is an electronic or manual device used for recording sales transactions, calculating totals and making change for customers. A point of sale system is a software system designed to help retailers manage sales transactions, inventory, and customer data. A checkout system is a system that automates the process of managing sales transactions at a retail store. A sales terminal is a device used for processing sales transactions.