They seem to have (if I understand correctly) degree-Celsius and degree-Fahrenheit symbols. So maybe Kelvin is included for consistency, and it just happens to look identical to Latin K?
IMO the confusing bit is giving it a lower case. It is a symbol that happens to look like an upper case, not an actual letter…
IMO the confusing bit is giving it a lower case. It is a symbol that happens to look like an upper case, not an actual letter…