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For stage directions there's also "House Left" and "House Right", which are from the perspective of the audience.

And in broadcast it can be referred to as 'Camera Left' and 'Camera Right', which is also from the audience perspective.

The camera's perspective. Audience perspective could be mediated by coarse special effects such as reflecting or turning the image.

I've heard it referred to as "Audience Left" and "Audience Right", though I'm not in the industry.