What’s the name of the structure that forms this arch?

Good day everybody,

I’m on the lookout for the technical identify of this type of architectural arch, the place the internal construction appears to be visually highlighted.

You’ll find an instance slightly below my signature.

Thanks on your time and assist.

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https://preview.redd.it/7wv7mqctj90b1.png?width=584&format=png&auto=webp&s=0de41915c9fa367b210aeb69d6e65c84e3364f95