This is an exerpt from an article regarding the logo:
"[The] NBA’s logo classification system is in its own world, but I’ll try to explain it. Every NBA team has the option of setting two primary logos — one intended for use domestically (“primary icon”) and one for use internationally (“global logo”). The global logo must include the full name of the team."
So essentially a global icon is just a logo with the full team name, likely for global recognition. By definition, these are 'global icons':