Dials for clocks can come in various styles, depending on the type of clock and its purpose. Analog are the traditional round type with hour and minute hands. They typically have Arabic numbers or Roman numerals to indicate the hours and smaller markings for the minutes. Some clocks, especially in military or scientific settings, use a 24-hour dial instead of the standard 12-hour. Each rotation of the hour hand represents a full 24-hour cycle. In more intricate clocks, particularly those with astronomical features, they may display the current phase of the moon. These typically show the waxing and waning of the moon over its lunar cycle. Some maritime or coastal clocks feature a tide dial. These indicate the expected times and heights of high and low tides for a particular location. These are just a few examples. There are many other special ones depending on the specific functions and features of the clock.