What symbols indicate that you are at the first and last frame?

The symbols that indicate you are at the first and last frame in AVID Media Composer are indeed both resembling an L. Specifically, the first frame is typically marked with a symbol that looks like an L (a small right angle, signifying the beginning of the clip), while the last frame is also shown with a similar L shape, but in a different orientation or style to differentiate the two positions.

This visual cue is important for editors as it allows them to quickly identify the start and end points of a clip, streamlining the editing process. Recognizing these symbols helps maintain proper navigation within the timeline, making it easier to manage and manipulate sequences effectively.