It's "up tack": https://en.wikipedia.org/wiki/Up_tack
I always pronounced it bottom because of https://en.wikipedia.org/wiki/Greatest_element_and_least_element#Top_and_bottom or https://en.wikipedia.org/wiki/Bottom_type which is how the Haskell report (where I got comfortable with the symbol) uses it.
I disagree. I think persons should name themselves. But, I understand there are practicalities that require some name to be assigned by outsiders at least until the person can talk.
For things that aren't conscious or are incapable of speech, I think we collectively assign a name. I'm fine giving higher weight to the name chosen by the "creator" or "discover", but I'm not fine with giving them veto power / final cut.