Unlike most other methods of measuring time, the specific hourglass represents the past and the future, which has made it a permanent time symbol itself.
Various computer programs and earlier versions of Windows may change the mouse cursor to an hourglass, and the program during this period may be in the middle of a task and may not accept user input. During this time other programs, in different windows, for example, can work properly. When the Windows hourglass does not disappear, it indicates that a program is an infinite loop that needs to be terminated, or is waiting for some external event (such as a user inserting a CD). On U+231B(?), Unicode also has an hourglass symbol.
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