[GuiA]

From the page:

"an elite training program for their most senior advertising executives and the people responsible for Google’s financial succes [...] For Google employees, the Black Belt should be a literal badge of honor to wear with pride [...] the result of this thinking is a brand identity built to represent the elite in every Google team"

From https://en.wikipedia.org/wiki/Black_belt_(martial_arts):

"In contrast to the "black belt as master" stereotype, a black belt commonly indicates the wearer is competent in a style's basic technique and principles [...] the shodan black belt is not the end of training but rather as a beginning to advanced learning: the individual now "knows how to walk" and may thus begin the "journey"."

Nice cultural appropriation :)