Frustum spelling

Just a quick note, I have seen frustum written frustRum, with an ‘r’. Both spelling seem to exist in the industry, so I wanted to know if it’s a mistake or not.

From the Wikipedia Frustum entry : “The spelling frustrum, listed as “erroneous” by the Oxford English Dictionary, is frequently encountered and might be considered a variant.”

Moreover Google returns 48 900 hits for FrustRum and 307 000 for Frustum.

So I’ll stick with the ‘Frustum’ spelling 😉

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