The term 'telephone button' refers to the buttons found on a telephone keypad. The four solutions for this term are STAR (4 letters), HOLD (4 letters), MNO (3 letters), and TUV (3 letters). STAR is an abbreviation for the STAR key, which is used to access additional features on a telephone, such as voicemail or call forwarding. HOLD is an abbreviation for the HOLD key, which is used to put a call on HOLD. MNO and TUV are abbreviations for the keys on a telephone keypad that correspond to the letters M, N, O, T, U, and V.