>> "The "o" stands for "open", "openness", "open source" and is placed where a "TM" symbol (indicating patents, trademarks, protection) would normally reside. Instead openness is the apertus° trademark."
It's also a completely different kind of thing so trademark probably wouldn't come into it even if they had one.
>> "Middle English, borrowed from Latin apertūra, from apertus, past participle of aperīre "to open" + -ūra -ure"
https://www.merriam-webster.com/dictionary/aperture
Sure, I just (honestly) wondered about trademarks.
https://apertus.org/about
>> "The "o" stands for "open", "openness", "open source" and is placed where a "TM" symbol (indicating patents, trademarks, protection) would normally reside. Instead openness is the apertus° trademark."
It's also a completely different kind of thing so trademark probably wouldn't come into it even if they had one.