What does ER and ES and the 'Y?' one mean?

I've seen ER, ES and Y? (YD?YP?) abbreviations before.

Are these particular stocks?

Also, what are eMinis?


It seems as though a lot of price-action traders are using the above set.
 
Thanks a lot, that is helpful.


So, S&P Futures, that is a single futures contract that is 'betting' on the value of the S&P?


Do regular platforms like ThinkOrSwim allow us to plot and trade these, or is everyone using custom software/platforms?
 
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