The meaning of this kanji (jitsu) is real, actual, or true. To help you remember this try to think of it as a judge (theoretically someone who dictates what's the truth). To remember that there are 3 strokes under the "wig" of the judge, you can just follow the same train of though and think of the legislative, judicial, and executive branch. Hope this helps!
(Contributed by: Nicole I of Wesleyan University on 1/31/07)