S: (n) acknowledgment, acknowledgement (a statement acknowledging something or someone) "she must have seen him but she gave no sign of acknowledgment"; "the preface contained an acknowledgment of those who had helped her"
S: (n) credits (a list of acknowledgements of those who contributed to the creation of a film (usually run at the end of the film))
S: (n) receipt (an acknowledgment (usually tangible) that payment has been made)