IASIP meaning in General ?

It's Always Sunny in Philadelphia is an American sitcom that premiered on FX on August 4, 2005, and moved to FXX beginning with the ninth season in 2013. It was created by Rob McElhenney, who developed it with Glenn Howerton. It is executive produced and primarily written by McElhenney, Howerton, and Charlie Day, all of whom star alongside Kaitlin Olson and Danny DeVito. The series follows the exploits of "The Gang," a group of narcissistic friends who run the Irish bar Paddy's Pub in South Philadelphia, Pennsylvania.

The series' fourteenth season concluded in November 2019. The series was renewed for a fifteenth season in May 2020, making it the longest-running live-action comedy series in American television history, replacing The Adventures of Ozzie and Harriet, which ran for 14 seasons between 1952 and 1966. In December 2020, the series was renewed for a total of four additional seasons, bringing it to season 18.