x1 is the Boltzmann kB constant linking energy with temperature [approximately equal to: 1.380 6488(13)×10−23 J/K], expressed in units x2 (default: unitless/dimensionless and equal to 1) in paradigm/system/metaphysics/universe x3 (default: this, our actual, physical universe)
x1 is the BIPM (French: Bureau international des poids et mesures; English: International Bureau of Weights and Measures) designation/result/standard/code for topic x2 applied to specific case/individual/group/entity/idea/thing x3 according to rule/BIPM specification x4 published by/according to mandating organization x5 (default: BIPM)
x1 is the black-body Stefan-Boltzmann sigmaSB constant [approximately equal to: 5.670373(21)×10(−8) W/(m2×K4)], expressed in units x2 (default: unitless/dimensionless and equal to pi2 / 480) in paradigm/system/metaphysics/universe x3 (default: this, our actual, physical universe)