OOP

The acronym OOP has multiple meanings:

The computer programming paradigm known as Object-oriented programming.
Books that are out of print, meaning that they are not printed anymore and only available used or in limited, left-over stocks.
Google has put into place what has been termed in the search engine optimization industry as an Over Optimization Penalty (OOP) that takes into account the incoming link text and the on-site keyword frequency. If too many sites that link to your site use link text containing a word that is repeated more than a certain number of times on your home page, that page will be assessed the penalty and either demoted to or removed entirely from the rankings.
In mathematics, Order of operations

See also