how do I name this so I can remove it?

Getting Started Newbie Questions
#1

I want to name this so I can remove it in the exitScene

<code>

letterHolder = {} 

numOfImages = 10

for i=1,numOfImages do

   letterHolder[i] = display.newImageRect(“topBlock.png”, 20, 20) 

   letterHolder[i].x = math.random(0, display.contentWidth) 

   letterHolder[i].y = math.random(0, display.contentHeight) 

end

<code>