English: Soddy line ${\displaystyle s}$, outer Soddy center ${\displaystyle S_{o}}$, inner Soddy center ${\displaystyle S_{i}}$, Gergonne point ${\displaystyle G}$, incenter ${\displaystyle I}$, inner Soddy circle ${\displaystyle s_{i}}$, outer Soddy circle ${\displaystyle s_{o}}$, Fletcher point ${\displaystyle F}$, Longchamps point Fletcher point ${\displaystyle L}$, Euler line ${\displaystyle e}$, Gergonne line ${\displaystyle g}$