(mathematics, combinatorics) For an odd integer, the result of multiplying all the odd integers from 1 to the given number; or for an even integer, the result of multiplying all the even integers from 2 to the given number; symbolised by a double exclamation mark (!!). For example, 9!! = 1 × 3 × 5 × 7 × 9 = 945.

(molecular biology, genetics) A protein that binds to specific DNA sequences, thereby controlling the flow (or transcription) of genetic information from DNA to mRNA.

(informal, US) An underperforming high school, especially one with low graduation rates.

(vulgar, derogatory or humorous) An infant, especially one who defecates a lot. / (vulgar, derogatory or humorous) A bird, animal, etc. that defecates a lot.

plural of factory class

(software, object-oriented programming) A class that creates an object having a non-trivial creation process, implementing the factory method pattern.

(software, object-oriented programming) Synonym of factory method pattern

(software, object-oriented programming) A creational design pattern that decouples the object creation by using an abstract method in the class.

(software, object-oriented programming) A creational design pattern that decouples the object creation by providing a group of individual factories by defining an abstract factory class.

(idiomatic, derogatory or humorous) An infant. / (idiomatic, derogatory or humorous) An animal whose defecation inconveniences humans.