triple bond

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A covalent bond in which three electron pairs are shared between two atoms.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry A covalent bond in which three electron pairs (instead of the usual one) are shared between two atoms; most common between carbon atoms and carbon or nitrogen atoms, but a few other forms are known. Symbolized in formulae as ≡.