Here are some examples:
* Photogram: A photograph made without a camera, using light to expose a photographic material.
* Electrocardiogram (ECG or EKG): A record of the electrical activity of the heart.
* Seismogram: A record of seismic waves, such as those produced by earthquakes.
* Sonogram: An image produced by ultrasound, often used in medical imaging.
There are also many other "-grams" used in specific fields, such as:
* Radiogram: A record of radio waves.
* Chromatogram: A record of the separation of substances by chromatography.
* Histogram: A graphical representation of the distribution of data.
So, the suffix "-gram" is a versatile one, indicating a record or image of something.