"target circle" is a correct and usable phrase in written English.
It is most often used in contexts related to marketing or business, and often in the context of describing a group or population that a company is targeting with a specific product or service. For example, "Our new product launch is specifically geared towards a younger target circle."
I recall a day when Charles, the guy who slept at the Italian Embassy, brought in a copy of the Post with the headline "KABULLSEYE!" above a target circle superimposed on a photo of a recently bombed building in Kabul.
Figure 3 An example of the network topology: the reference node (center) is trying to detect a reference target (circle).
As such, participants were instructed to ignore the movements of the red target circle and were not instructed to perform the tracking task.
Two additional beeps spaced 500 ms apart were heard once the target circle was reached to indicate how long subjects had to hold a steady hand position within the target circle.
We instructed the subjects that a rectangle would be presented to indicate that 1.6 seconds later it would flash again but quickly, containing or not the target circle.
Subjects were instructed to begin movement on the third beep and to try to reach the target circle by the fourth beep, 600 ms later.
Among the impressive graphite drawings by Leydenfrost is a God's-eye view of Washington, overlaid by glowing, semitransparent target circles and white arrows pointing out escape routes in case of atomic attack.
The calibrating local curvatures for circles with radii from r = 2 to 120 pixel units are basically identical to the inverse of the radii of the target circles (=1/r) (Fig. 6).
From the inverted results shown in Fig. 7d f, we can clearly see that the Young's modulus exhibits high anomalous values and Poisson's ratio shows low anomalous values in the target circled with dark ellipses, which means that the brittleness of the circled target is high.
The Facebook page showed a map of Congressman that she wanted to "target" circled with a gun cross hair scope.
The start and target circles were displayed throughout the entire experiment under both visual conditions.
