According to the Petra Christian University Library Guidelines , "2x1" spacing rules are often applied as follows: Academic Document Formatting (UK Petra)

: In some animal welfare contexts, a "2x1 cage" refers to a standard but often cramped enclosure size (

In the context of academic writing at , "2x1" (often written as

: Establishments like Hard Rock Cafe Rome use "2x1" to signify "Buy One Get One" (BOGO) deals during Happy Hour on select drinks.