What does the suffix "-gram" refer to?

The suffix "-gram" is derived from the Greek word "gramma," which means "something written" or "a letter." In medical and scientific terminology, it typically refers to a record or written representation of data or information. For example, in the terms "photogram" (a picture made by exposing light-sensitive material) or "electrocardiogram" (a record of the electrical activity of the heart), the "-gram" indicates that it is a written record of a specific type of data or measurement.

While options related to "measurement," "picture," and "recording" may seem relevant in certain contexts, they do not align with the specific definition associated with the suffix "-gram." The emphasis is on the act of writing or recording information, making the choice that indicates "written" the most accurate in this context.