Language

Language is one of the basic fingerprints of the browser! Browser basic fingerprint is the characteristic identification that any browser has, including screen resolution, hardware type, operating system, user agent, system font, language, browser plug-in, browser extension, browser settings, time zone difference, and many other information. These fingerprint information is similar to human height, age, and so on, with a high probability of conflict, and can only be used as auxiliary identification.

Source: https://www.digitalcitizen.life/what-screen-resolution-or-aspect-ratio-what-do-720p-1080i-1080p-mean/