Stupid Question: What the fuck is an Index?!

Terribly sorry for the ignorance of this post.

I recently started trying to learn how to count just for shits and giggles and to see if I could actually learn it in my free time. Between a few helpful sites and YouTube channels (thank you BJA), I’ve more or less worked out the very basics (I’ve never actually played legitimate blackjack before so I had to figure out the rules and basic strategy first).

I have just now graduated to trying to decode the Illustrious 18 and it seems I’ve hit a major roadblock: Every single source I look into seems to mention all the relevant concepts (basic, EV, I 18, bet spreads, etc.) but I cannot for the life of me figure out what the hell an index is.

I tried to power through and figured somewhere along the way the answer would become clear, but in tackling the Illustrious 18 (and particularly after I found my way onto this counting simulator) it seems that if I’m going to get any further I need to know what this means.


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