the tick is a short term trading indicator, it's the number of stocks ticking up versus the number of stocks ticking down, if it's a plus number, then there are that many more stocks moving up than down. and vice versa for a minus
the trin is a another short term indicator, it indicates weather volume is flowing into advancing or declining stocks. 1.0 is basically a even point, anything above 1.0 it's generally a bearish market, and anything below it's generally a bullish market(really for bullish you want it below .8)
this is the basics for these there is more to them than what i have mentioned,
i don't use the prem.