Button for "Play, but from beginning" for a scrubber UX

Consider a typical video-editing style timeline:

There's the usual Play button: a right arrow.

There's the usual Pause button: two bars.

-----------------|-----------
         >  ||

However, I want to have a "Play, but from beginnning" button.

When you want to "play, but from the beginning" you have to: bring the slider to the beginning, before hitting play. That is annoying. It would be better if there was a "play, but from the beginning" button.

What should the symbol be?

Help me out gang!

Lame idea from non-designer...

enter image description here

Does that get anyone thinking? It's not really very good: the one on the left probably suggests "cycle around in some sense" It's hard to express "go back to the frickin' beginning and then Play"!

Complication: most editors additionally have a "Play, but fullscreen" concept, yet another play-related button.

Bonus: If there's a keyboard, space-bar usually toggles Play/Pause. Is there a good keyboard UX for "Play from beginning"?

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