CENTER: The American Sign Language (ASL) sign for "center"
 

Typically the concept of "center" is done by circling a bent hand and touching the fingertips into the palm of the non-dominant hand. Also see: MIDDLE.

CENTER:

Sample sentence: Are you looking for the Deaf Center?

Middle:  Circle the tip of the dominant middle finger (bent at the large knuckle) and then plant it into the upturned palm of the non-dominant hand:

Sample sentence: My brother's middle name is Robert.

Notes:  See: AVERAGE