What is 1 8 1 8?

1 8 1 8 could refer to a variety of different things, such as:

• The year 1818, which was a leap year starting on Thursday.
• The model year of a car or other product.
• A numerical sequence or code.
• A special date or anniversary.
• A password or access code.
• A set of four separate numbers.

Without more context, it is difficult to provide specific information about 1 8 1 8.