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What is the that sensor in the picture?

Airbus A220 sensors

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That's one of the two ice detectors manufactured by Collins. Below is not precisely the model used by A220, but serves to illustrate the general layout of the unit:

Ice-Detector

Image ref: Collins

From this Collins fact sheet, ice detectors

use a magnetostrictive technology to drive the sensing probe to resonate at its natural frequency. As ice accretes on the probe, a shift in resonance frequency occurs. When the resonance frequency reaches the set point, an ice signal is activated...

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    $\begingroup$ This picture shows the probe more clearly. It looks exactly like the image you show (even if it is not the exact same model). $\endgroup$ – Bianfable May 27 at 13:35

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