It is a nickname for the heat resistant ceramic case in which a coil of resistance wire is potted.
Ceramic heating resistor.
Cement resistor only describes the appearance of common power resistors like that shown above.
A typical extent of the rings is 5 mm.
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However there are also advanced ceramic heaters that have a different kind of heating element.
The good thermal conduction and the low thermal mass of the ceramic material allow extremely fast heating rates a uniform temperature distribution and high control accuracy.
Ceramic heating rings made of silicon nitride can be produced with an outer diameter of up to 300 mm.
Ceramic heaters can take a variety of form factors to handle specific kinds of applications.
They are most often wire wound resistors.
You can also choose from other ceramic resistor heater as well as from other ceramic resistor heater and whether ceramic resistor heater is other.