I can't help but think of the Ritual of the Calling of the Engineer. They date back nearly a century, and their ceremonies are conducted in private. The initiation ritual is conducted by the Corporation of the Seven Wardens, with only new and past initiates present, but no guests. Upon initiation though, each new member is given a symbolic Iron Ring, which is rumored to be forged from the mangled iron scavenged from the Quebec Bridge disaster on 1907. The ring is distinctly angular rather than smooth and comfortable, and is worn on the pinky of the dominant hand so that it will slide across an engineer's drafting table or paper as he or she writes. This is a constant reminder of an engineers lofty duties and responsibilities, and of those who died during the Quebec Bridge collapse.

For people in the US, there's the Order of the Engineer. Before joining, members must swear an oath to abide by "The Obligation of an Engineer":

I am an engineer, in my profession I take deep pride.

To it I owe solemn obligations.

Since the stone age, human progress has been spurred by the engineering genius.

Engineers have made usable nature's vast resources of material and energy for humanity's benefit.

Engineers have vitalized and turned to practical use the principles of science and the means of technology.

Were it not for this heritage of accumulated experience, my efforts would be feeble.

As an engineer, I pledge to practice integrity and fair dealing, tolerance, and respect, and to uphold devotion to the standards and the dignity of my profession, conscious always that my skill carries with it the obligation to serve humanity by making the best use of Earth's precious wealth.

As an engineer, I shall participate in none but honest enterprises.

When needed, my skill and knowledge shall be given without reservation for the public good.

In the performance of duty and in fidelity to my profession, I shall give the utmost.