It's just names of two element but when their symbols are put together, it forms NiGa which is means the N-word. It is used to hide the fact that you are saying using the N-word in a sentence while trying to avoid racist backlash.
A:Hey my Nickel Gallium
B:What you sayin?
*B spents 5 minutes thinking*
B: BITCH YOU HAVENT GOT THAT PASS, I AM CALLING THE POLICE
B:What you sayin?
*B spents 5 minutes thinking*
B: BITCH YOU HAVENT GOT THAT PASS, I AM CALLING THE POLICE
by CuriousWanderer May 5, 2019