Final answer:
The medial abbreviation for 'hour' is 'hr,' which is widely used in various contexts like timetables and scheduling.
Step-by-step explanation:
The question asks for the medial abbreviation that represents every hour. The common medial abbreviation used for representing time, specifically hours, is "hr". This abbreviation is used across various contexts, including timetables, schedules, and when referencing the length of events or activities.
For example, if a class lasts 50 minutes, it is often rounded off to the nearest hour for ease of reference and might be referred to as a 1 hr class. Understanding these abbreviations is helpful for time management and planning throughout one's academic and professional life.