Final answer:
The suffix -gram means a record or something written, used to form nouns representing types of records or documents.
Step-by-step explanation:
The suffix -gram refers to a record or something written. It is commonly used to create nouns that describe a type of record, message, or document. For instance, a telegram is a message sent through telegraphy and recorded in written or printed form. Additionally, an electrocardiogram (ECG) is a record of the electrical activity of the heart. The suffix can allude to both the record itself and the process of recording.