Let $AB$ be a segment of length $2$.  The locus of points $P$ such that the $P$-median of triangle $ABP$ and its reflection over the $P$-angle bisector of triangle $ABP$ are perpendicular determines some region $R$.  Find the area of $R$.
1. **Set up the problem using complex numbers:**
   Let \( A = -1 \), \( B = 1 \), and \( P = z \) where \( z \) is a complex number. The length of segment \( AB \) is \( 2 \).

2. **Condition for perpendicular medians:**
   The condition given is that the \( P \)-median of triangle \( ABP \) and its reflection over the \( P \)-angle bisector of triangle \( ABP \) are perpendicular. This condition can be translated into the complex plane.

3. **Expression for the \( P \)-median:**
   The \( P \)-median of triangle \( ABP \) is the line segment from \( P \) to the midpoint of \( AB \). The midpoint of \( AB \) is \( 0 \) (since \( A = -1 \) and \( B = 1 \)).

4. **Reflection over the \( P \)-angle bisector:**
   The reflection of the \( P \)-median over the \( P \)-angle bisector involves some geometric transformations, but we can simplify the problem by considering the condition given in the problem statement.

5. **Condition for perpendicularity:**
   The condition is equivalent to the expression \( \frac{z^2}{(z+1)(z-1)} \) being purely imaginary. This means that the real part of \( \frac{z^2}{(z+1)(z-1)} \) must be zero.

6. **Set up the equation:**
   \[
   \frac{z^2}{(z+1)(z-1)} = \frac{z^2}{z^2 - 1}
   \]
   For this to be purely imaginary, the real part must be zero. Setting this equal to the negative of its conjugate gives:
   \[
   z^4 = z^2 + \overline{z^2}
   \]

7. **Convert to polar coordinates:**
   Let \( z = re^{i\theta} \). Then \( z^2 = r^2 e^{i2\theta} \) and \( \overline{z^2} = r^2 e^{-i2\theta} \).

8. **Simplify the equation:**
   \[
   z^4 = z^2 + \overline{z^2} \implies r^4 e^{i4\theta} = r^2 e^{i2\theta} + r^2 e^{-i2\theta}
   \]
   \[
   r^4 e^{i4\theta} = r^2 (e^{i2\theta} + e^{-i2\theta}) = r^2 \cdot 2\cos(2\theta)
   \]
   \[
   r^4 e^{i4\theta} = 2r^2 \cos(2\theta)
   \]

9. **Separate real and imaginary parts:**
   For the equation to hold, the imaginary part must be zero:
   \[
   r^4 \sin(4\theta) = 0
   \]
   This implies \( \sin(4\theta) = 0 \), so \( 4\theta = k\pi \) for integer \( k \). Thus, \( \theta = \frac{k\pi}{4} \).

10. **Determine the region \( R \):**
    The real part gives:
    \[
    r^4 \cos(4\theta) = 2r^2 \cos(2\theta)
    \]
    \[
    r^2 \cos(4\theta) = 2 \cos(2\theta)
    \]
    \[
    r^2 = 2 \quad \text{(since } \cos(4\theta) = 1 \text{ and } \cos(2\theta) = 1\text{)}
    \]
    \[
    r = \sqrt{2}
    \]

11. **Calculate the area of region \( R \):**
    The region \( R \) is a circle with radius \( \sqrt{2} \). The area of a circle is given by \( \pi r^2 \):
    \[
    \text{Area} = \pi (\sqrt{2})^2 = 2\pi
    \]

The final answer is \(\boxed{2\pi}\)