Starship Asterisk*

...and i don't know what it's called Is that a moondog ? or a moonbow ? knowing that the diffracted light was only visible in a large and thin foggy cloud, probably high in the atmosphere ?

Did it look circular? https://www.atoptics.co.uk/halo/circmoon.htm

If not, try looking around atoptics to see if you can find what you saw.

it was possibly an arc of that circle, because the cloud was under the moon, not right in front of it. Thanks, i'll look