\input zb-basic \input zb-ioport \iteman{io-port 05556179} \itemau{Fukuda, Tomotaka; Negami, Seiya; Tucker, Thomas W.} \itemti{3-connected planar graphs are 2-distinguishable with few exceptions.} \itemso{Yokohama Math. J. 54, No. 2, 143-153 (2008).} \itemab Summary: A graph is said to be 2-distinguishable if there is a subset $S\subset V(G)$ such that any automorphism $\sigma :G\to G$ with $\sigma(S) = S$ must be the identity map over $G$. We shall prove that every 3-connected planar graph is 2-distinguishable, except $K_4$, $K_{2,2,2}$, $Q_3$, $W_4$, $W_5$, $C_3 + \overline K_2$ and $C_5 + \overline K_2$. \itemrv{~} \itemcc{} \itemut{distinguishing number; planar graphs} \itemli{} \end