Sun Microsystems — Before it was bought by Oracle, Sun was a major computer manufacturer. Its logo is a perfect ambigram; it can be read from any direction. (Note also that the graphic doesn’t actually include an S, merely artfully arranged u’s and n’s.)
Toblerone — See the dancing bear in the mountain? The design is a tribute to the Swiss town where the chocolate was developed.
Tostitos — The not-so-hidden design within this logo conjures up feelings of togetherness and friendship over chips and salsa.
Tour de France — Slightly more abstract than the other examples, the Tour de France logo contains a well-integrated biker.