x1 measures to be equal to x2 (li; default: 1) g of acceleration according to standard x3 (default is as in notes).
Non-SI unit of acceleration. x1 should be an acceleration (and not, for example, directly an object). x3 is, by default, the local value of acceleration due to gravity on Earth's surface, and is conventionally defined to be exactly 9.80665 m/s2 as of 2023-02-28.