In this answer

0.21 cal/g*C.

does the degree small zero go over the g or over the C

0.21cal/g[sup]o[/sup]C

do you mean this?

hm...

0.21cal/goC

No, the * symbol is the times sign and I used that as in 0.21 cal/g*C instead of just writing 0.21 cal/gC. It is read as "0.21 calories per gram per degree C" but most people say "0.21 calories per gram degree C." The degree sign is made by typing < followed by sup followed by the small letter o followed by >. Then you must turn off the superscript by < followed by / followed by sup followed by >. It works like this. 0.21 cal/g*oC.

In practice on these boards we just omit the degree symbol.

The small degree symbol (°) is used to denote temperature units, such as Celsius (°C) or Fahrenheit (°F). In the answer you provided, "0.21 cal/g*C," the degree symbol (°) would typically go over the C to indicate Celsius.

If you are asking about the small zero symbol, it typically doesn't go over any particular unit. However, if you are referring to a superscript zero (⁰), it can be used to represent the degree symbol for an absolute temperature scale, such as Kelvin (K). But in the given context, it is not necessary to include the superscript zero.

If you are referring to a different symbol, please provide more information so I can give a more specific explanation.