The phrase "a sign of dedication" is correct and usable in written English.
You can use it to indicate that something demonstrates commitment or loyalty to a cause, task, or person.
Example: "Her willingness to work late every night is truly a sign of dedication to the project."
Alternatives: "an indication of commitment" or "a demonstration of loyalty."
For example, Mr. Obama plans to include what aides call "down payments" on his promises to expand health care coverage and promote energy independence in the economic recovery package he is developing, as a sign of dedication to the broader goals.
Millennials also don't buy into the idea that putting in a lot of hours is a sign of dedication.
We have to remember that the culture still prevailing in many workplaces women are trying to make their way into was created by men, and is dominated by the antiquated notion that burnout is a sign of dedication and commitment.
His appearance at all was a sign of his dedication".
In fact, the resignation is a sign of their dedication to the program".
In a sign of her dedication to China, Ann Chiang opted to read her oath in Mandarin, the language of the mainland, rather than that of Hong Kong, Cantonese.
In Japan, he explained, people sleep overnight in town as a sign of their dedication to business; they rent cubicles just wide enough for a body, like coffins, he said, and for days when he did not return she thought of those small compartments and she chose to believe him.
They make the donation because they love KQED, and the hoodie is a sign of their dedication.
The BlackBerry of the future will be one-part software company, one part idea, a stamp of approval for other companies to wear as a sign of their dedication to notions of smartphone security and productivity.
Luigi told me it was imperative that every single dollar raised went to the charity -- a real sign of dedication.
