Mark atop an "i" (3)
I believe the answer is:
dot
(Other definitions for dot that I've seen before include "Shorter of the two signals used in Morse code" , "Point; speck" , "Spot, speck" , "Internet punctuation mark" , "'Spot, tiny mark (3)'" .)
I believe the answer is:
dot
(Other definitions for dot that I've seen before include "Shorter of the two signals used in Morse code" , "Point; speck" , "Spot, speck" , "Internet punctuation mark" , "'Spot, tiny mark (3)'" .)