What Unicode characters represent "time"?

What Unicode character symbol(s) express duration (such as a clock, hourglass, or other timepiece)? 开发者_如何学JAVA

For example "★3⅔" instead of "3 hours and forty minutes", where ★ is a time symbol.

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The following code points exist related to clocks, watches, and other devices to indicate time:

⌚  U+0231A  WATCH
⌛  U+0231B  HOURGLASS
⏰  U+023F0  ALARM CLOCK
⏱  U+023F1  STOPWATCH
⏲  U+023F2  TIMER CLOCK
⏳  U+023F3  HOURGLASS WITH FLOWING SAND
⧖  U+029D6  WHITE HOURGLASS
⧗  U+029D7  BLACK HOURGLASS