A check indicator is a tool that helps to monitor and keep track of certain activities or processes. There are many synonyms for this word that can be used interchangeably depending on the context. Some of the most common alternatives include monitoring device, tracking system, progress tracker, performance gauge, and assessment tool. Other synonyms for check indicator could be evaluation instrument, measurement tool, feedback mechanism, measurement device, and audit trail. These synonyms can be used to describe different types of check indicators, from software applications to physical devices. Ultimately, the choice of the right synonym depends on the specific context and the purpose of the check indicator.