A screw log refers to a tool or device used to give direction to a vessel in water. There are a few synonyms for the term screw log that can be used interchangeably. Some of these include "ship's log," "marine log," "nautical log," "log book," and "voyage log." Additionally, "sea log" is another common term used to describe the same tool. Each of these synonyms encompasses the same idea of recording and measuring a vessel's progress throughout a voyage. These terms can be used in different contexts, but they all denote the same tool used in the maritime industry.