x1 is Avogadro constant NA [approximately equal to: 6.02214129(27) × 1023 mol-1], expressed in units x2 in paradigm/system/metaphysics/universe x3 (default: this, our actual, physical universe).
See also: "plankexu", "tcelerita", "gravnutnoia", "boltsemaku", ".ocnerta", "molro", "kamre".