What does the code 8647 that worries Donald Trump mean?

During the recent "No kings" protests against the immigration policy of the American president, the code 8647 could be seen on placards and signs, which has become a symbol of opposition to Trump.

To understand this, we need to go back to mid-May. American president Donald Trump had criticised former FBI director James Comey about an Instagram post, now deleted, which featured the number "8647" written out in seashells.

The former FBI head said at the time that it was innocent on his part, but Trump replied, "He knew exactly what it meant. A child knows what it means. If you are the FBI director and you don’t know what that means, that means an assassination".
In the 1930s and 40s in the United States, numeric codes were used in restaurants and 86 meant "to throw out or eject" and today means "to get rid of". The 47 refers to the 47th president of the United States, so Donald Trump.
The demonstrators’ placards are therefore calling for Trump to be got rid of. And the code 8647 has become one of the slogans of anti-Trump supporters.

(MH with D. Rodriguez - Source: Axios - Photo: © DPA - NurPhoto - Mike Campbell)