What does Tilda mean in Pandas?

What does Tilda mean in this case?

  df.loc [~ non_numberic_profits]     
 in the Stolbets  non_numberic_profits  Lines were set that do not meet the type of data  float . That is, not numbers, but some letters or symbols. 
  
 What does Tilda mean in this case? What function does it perform? 
  
 after this time, the following line of code 
  
  df.profit = " df.profit.apply (pd.to_numeric)     
 as I understand it, it transforms it precisely into the data type  float . But what does she transform? The remaining values? I do not quite understand what the operator Tilda performs in this case.