This is a wooden frame window with transparent glass. The color of window frame may different in different platform.
🪟 generally means a window, and can also mean the outside and ventilation. There is a famous saying says that "when God closes a door, he opens a window, but it's up to you to find it", so 🪟 can also represent opportunities. Related emojis:
🏠🏢⛪🏙