The term "11ου" refers to the Greek ordinal number for "11th." In Greek, ordinal numbers are used to indicate the position of something in a sequence, such as dates, rankings, or levels. The word is derived from the cardinal number "11" and is commonly used in various contexts, including education and events. In the context of dates, "11ου" is often used to specify the 11th day of a month. For example, "11ου Νοεμβρίου" means "11th of November." This format is typical in Greek-speaking countries, where the day precedes the month in written dates, aligning with the broader European date format.