F_{1}, F_{2} - fixed points:**
foci** or **focal points** of the hyperbola
A, B - **vertices** of the hyperbola S - **center **
of the** **hyperbola
2a=|AB| - **transverse** or **major axis **
2b=|CD| - **conjugate **or **minor axis** e - **linear**
**eccentricity** e^{2 }= a^{2 }+ b^{2}
r_{1}, r_{2} - **radial vectors** of the
point T |