Not totally a signal but a simple analyzation of how volumes behave for the day. Noting the price low and high for that day, looking at the chart on when it experience a price rise or dump on that day and many more. Im not a fan of those who are using a literal trading signal right directly at messaging platform wherein bot will say to buy at those and dump or something like that.

But for bitcoin trading, no need for any signal and technical analysis as no doubt it will increase further more as days passing by.