An inbox tray in the real world is one where mail is deposited to be sorted later. In the virtual world the Inbox emoji which consists of a try with an arrow pointing down is often used as a computer icon.
The inbox tray emoji was introduced in 2010 and released as part of the Unicode 11.0 standard. This emoji can be found under the objects
category. Because the inbox tray emoji has been around for quite some time, it should display correctly in the majority of operating systems.