The link wasn't working but I found what I think is being shared.

Neo-Nazis also employ various number symbols:

18, code for Adolf Hitler. The number comes from the position of the letters in the alphabet: A = 1, H = 8.[11]

88, code for "Heil Hitler", a phrase used in the Nazi salute.[12] Also used as a reference to the "88 Precepts", a manifesto written by white supremacist David Lane.

14, from the Fourteen Words coined by David Lane: "We must secure the existence of our people and a future for white children."[13]

14 and 88 are sometimes combined with each other (i.e. 14/88, 8814, 1488).[14] They are also sometimes depicted on dice.[15]

It's also amateur radio slang. Not everything is about Neo-Nazis.

But to another commenter - Russian Neo-Nazis use 1488 too.

oh shit i didn't even spot it, was right in front of us

Yes because Putin a Russian speaking Russian planned out this for a few English speaking American Neo Nazi.

Just in case you were wondering the 8th letter of the Russian alphabet is Ж it make a kind of zh sound.