(source: https://www.rsc.org/periodic-table/element/21/scandium)

Aluminium-scandium alloy has been used in aircraft,  spacecraft, ships, cars, rolling stock, and high-end bicycle frames and baseball bats: High-Scandium Aluminium Alloy And Method For Making Semi-Finished Products (1995)).

Scandium iodide is incorporated in mercury vapour lamps to produce a highly efficient light source resembling sunlight (Mercury vapour lamp contg. sodium- and scandium- iodide(s) – where lithium iodide is added to increase red radiation (1979)).

These lamps help television cameras to reproduce colour well when filming indoors or at night-time.

Scandium tritritide can be used in beta-particle detectors (Ionization Detector Utilizing Tritiated Scandium With An Acceptable Tritium Emanation Rate At High Temperature (1978)).

References:

All patent information has been obtained from Espacenet (European Patent Office).