Final answer:
The Swiss chocolate bar featuring the Matterhorn on its label is Toblerone, known for its triangular shape representing the Swiss Alps.
Step-by-step explanation:
The triangular Swiss chocolate bar that features the Matterhorn on its label is Toblerone. Toblerone was created by Theodor Tobler in Bern, Switzerland, in 1908, and its unique triangular shape is said to have been inspired by the Matterhorn mountain in the Swiss Alps. This iconic chocolate is known for its distinctive packaging and its series of joined triangular prisms.