## Wikipedia - Grado Celsius Celsius temperature, $$t$$, $$\theta$$

https://doi.org/10.1351/goldbook.C00928
@T06321@ minus $$273.15\ \text{K}$$, invariably expressed in the SI unit @D01561@ ($$^{\unicode{x26ac}}\text{C}$$) which is equal to the @K03374@. Sometimes the misnomer centigrade temperature is used for Celsius temperature.
Sources:
Green Book, 2nd ed., p. 48 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 965 [Terms] [Paper]