Star Trek: Deep Space Nine - Floor Mark from Previous Shot
When watching S02E07 of DS9 in the scene where Quark grovels to Zek about a failed transaction with a new Gamma Quadrent species you will notice that the film crew have left a red 't' shaped mark on the floor from the previous shot where Kira walks up to the table.
The mark is under the table between Quark's right hand and Zek.
Here is proof:
You will need episode S02E07