In the Bible it says He carried His own cross.

* Whether the wooden sculpture is the work of the 16th-century artist Michelangelo or not, it illustrates that the impalement of Christ on a cross frame has not always been so certain as Christendom’s leaders today would have people believe. For example, the 16th-century Roman Catholic scholar Justus Lipsius illustrated impalement on an upright stake in his book “De Cruce Liber Primus.” This fits the meaning of the Greek word used in the Bible to describe the impalement of Christ—“stauros”—which “denotes, primarily, an upright pale or stake.”—“An Expository Dictionary of New Testament Words,” W. E. Vine. ** The “cross” was a religious symbol long before the time of Christ. A French Catholic dictionary admits: “It cannot be denied that the cross had been employed as a religious symbol by the pagans. It is found in different forms on a large number of Asiatic, European, and even American monuments.” Since the Bible gives no description of its shape, and the Greek words the Bible used meant “stake,” “post” or “tree,” rather than “cross,” then the burden really rests upon those who say that the post that Christ died upon had a crossbeam to prove that it did. And since no “cross worship” was described in the writings of Jesus’ apostles, but this was a “sacred” symbol to the pagans, its worship cannot be recommended for true Christians today.

cross

Cross

With the number of crosses around I'd assume the cross was it!