2 is considered a good number

From Wikipedia
Two
The number 2 (两, Pinyin:èr or liăng) is most often considered a good number in Chinese culture. There is a Chinese saying: "good things come in pairs". It is common to repeat characters in product brand names, such as double happiness, which even has its own character 囍, a combination of two 喜. In Cantonese, two (jyutping: ji6 or loeng5) is homophone of the characters for "easy" (易) and "bright" (亮). In Northern China, the number, when used as an adjective, can also mean "stupid"