Lossy compressors don't have the same constraints as a lossless compressor. If you data your input, compress it, and then decompress it, the output is not identical to the input. This allows the compressor to potentially compress the data far more than even the ideal lossless compressor hypothesized above.
The question mark (?), also known as the interrogation point, query, and eroteme, is a punctuation mark that indicates an interrogative clause, or phrase in many languages. The question mark is not used for indirect questions.
In American English, the term pound sign usually refers to the symbol #, and the corresponding telephone key is called the pound key. The symbols Â£ and # are both referred to as the pound sign in Canadian English (# is also referred to as the number sign and noughts-and-crosses board).