Is there a generic name for something with advent calendar-like windows? [closed]

Advent calendars are a panel with little windows that reveal some surprise inside (maybe a picture, sweet, or some message). It seems unlikely to me that advent calendars are the only device that has this form factor (windows with things inside). As such, is there a generic name for such a device, independent of its function in the religious holiday?

Solution 1:

The ones for other events are called "countdown calendars":

• Midnight Ramadan Mosque Countdown Calendar
• Hanukkah Countdown Calendar

There are other things that can be described as having "windows with things inside" but I don't think there's a term that generalizes well. For example, a pill organizer is described with just those words.

For an adjective, maybe compartmentalized.