As a disclaimer, I want to state that there are many different types and styles of scripts. However, these abbreviations are fairly universal within the film industry.
When writing a video script, you will never write out the full name of a shot, but instead, use abbreviations. You will primarily use these three shot types: the Long Shot as LS, the Medium Shot as MS and the Close Up Shot as CU.
Some variations to these shots include the Extreme Long Shot abbreviated as ELS or EXS, the Medium Long Shot or MLS, the Medium Close Up or MCU and the Extreme Close Up, abbreviated as ECU or XCU.
Camera movement such as panning, tilting, boom/dolly, handheld or zooming would also be listed.
Also, video sources will also be listed on the script as Original Video (b-roll), Archive Video, Graphics, Animation, and Talent.
Within talent, there are talent sources that must be noted in the script. These are Voice Over or VO, Voice on Camera or VOC, Sound on Tape (interview subject) or SOT and Dialogue.
Why is it important to know these abbreviations when writing your script?
It is essential to know these abbreviations not only because it saves time, but because everyone else in the industry relies on using them on a day-to-day basis.