The Mechanical System Sizing + Layout video shows a packaged terminal unit (PTAC) as an example of a fan coil unit (FCU). The diagram also shows the units penetrating the exterior wall, which is characteristic of a PTAC because it requires outdoor air access for the condenser coil. A typical hydronic FCU does not require a facade penetration because it uses chilled/hot water from a central system and recirculates indoor air.
The same photo was used in a PPD video to illustrate a fan coil unit.