pin·point 
(p
ĭn
point
′)
n.1. A very small or sharp point: a pinpoint of light.
2. A point on a map marking a precise location or target.
3. A very small amount of something: had barely a pinpoint of hope.
tr.v. pin·point·ed,
pin·point·ing,
pin·points 1. To locate or identify with precision: pinpointed the source of the problem.
2. To take precise aim at: pinpoint a target.
adj.1. Meticulously precise: pinpoint accuracy.
2. Extremely small; minuscule: pinpoint creatures.