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Occasionally, 'Drop x' is used to clarify chord voicing. I guess it's a more focussed way of explaining how notes of a chord are voiced. Certainly more specific than 'inversions', which only specify what the lowest note is.
What is the ruling behind 'drop x', how important is it in our playing, and where did it come from originally?
Start from an assumption that the 'normal' construction of a chord is to have all the notes as close as possible - basically a 'pile of 3rds'. Take the second-highest note, drop it an octave. That's Drop 2 voicing. Third-highest - well, you get the idea!
Drop 2 fits the layout of a guitar rather well. Here's a nice discussion of it in guitar-specific terms: https://www.guitarlessonworld.com/lessons/drop-2-chords/
On keyboard, or when arranging for other instruments - e.g. a 5-piece sax section - open voicings are very common.
