Small, icon-sized image that represents a larger image; commonly used on the Web and in clip art galleries; may be created by various photo or video editing programs; also produced by some digital cameras as small sample images of photos captured by the camera.

Macro file used by Thermwood CNC Routers; contains router machining instructions that automate router processes; a list of CNC events are also saved in a file named "hist.thm."

Theme file used by Sony Ericsson mobile phones; stores settings used to customize the user interface of the cell phone; includes custom window and text colors, icons, wallpaper, and other images; can be created and edited using the free Themes Creator from Sony Ericsson.

Thumbnail image of a video clip created when the video clip is saved; stores a small image from the first frame of the video clip it represents; used for visually scanning through multiple video clips.

Video thumbnails are often created on digital video cameras and digital cameras that record video; THM files may or may not be transferred to the computer depending on what software is used to import the video; each THM file shares the same filename as the video clip it represents, i.e. "clip001.avi" and clip001.thm."