As Spehro explained, it looks like a thermistor touching (i.e. thermally-coupled to) the resistor next to it (R20) (notice the diagonal line on the silkscreen between the two components, also suggesting a coupling between them).
However there is one more piece of evidence not yet mentioned, which adds extra confirmation.
Notice the reference designator next to the unidentified component is "H".
The product manufacturer (Noris Tachometerwerk) is German, and one German-language term for an NTC thermistor is "(der) Heißleiter".
So the reference designator "H" for that component, definitely fits with it being a thermistor.