What did the digits 5081 have to do with computers?

Answer 1

It refers to a standard punchcard format created by IBM and adopted by many other computer manufacturers. Here's more information:

The early applications of punched cards all used specifically-designed card layouts. It wasn't until around 1928 that punched cards and machines were made "general purpose". The rectangular, round, or oval bits of paper punched out are called chad (recently, chads) or chips (in IBM usage). Multi-character data, such as words or large numbers, were stored in adjacent card columns known as fields. A group of cards is called a deck. One upper corner of a card was usually cut so that cards not orientated correctly, or cards with different corner cuts, could be easily identified. Cards were commonly printed so that the row and column position of a punch could be identified. For some applications printing might have included fields, named and marked by vertical lines, logos, and more.

The most common printed punched card was the IBM 5081. Indeed, it was so common that other card vendors used the same number and even users knew its number.

Answer 2

It also refers to a type of PC board to wire connector :
http://www.allproducts.com/manufacture1/afortunet/5081.html

Or, to a 5081 IBM monitor made back in 1987.
Could be many things .. please provide a context.

regards,
Philip T