The phrase "a form of marking" is correct and usable in written English.
It can be used when discussing different methods or styles of indicating or labeling something.
Example: "In the art world, a form of marking can be seen in the use of brush strokes to convey emotion."
Alternatives: "a type of indication" or "a method of labeling".
Historically, heels have been used as a form of marking power: some 10,000 years ago, tribal chieftains were known to wear stilts at meetings to allow them to look down on the members of their tribe.
This was not a form of marking intended to deface the tree, it was a ritual of remembering my roots; adding my initials next to his initials and his father before him made me feel part of something larger than myself; a family that would extend far beyond my years.
He was the subject of an aggressive form of marking from Gordon Greer when Scotland drew 2-2 in Poland earlier in the Euro 2016 campaign, but that kind of treatment will not diminish him.
Alternatively, it may be a form of scent marking.
In a form of reverse "Yellow Star of David" campaign reminiscent of the Nazi pogrom against Jews, Buddhist owned businesses are marked with a form of label denied to those owned/managed by Muslims to facilitate the boycott and efforts to force out the Muslims.
The form of marking indicates at a glance whether radio instrument guidance is available at any particular airfield.
But the fact that the industry is now losing its appeal, both as a business and as a form of employment, marks a new and dangerous phase in its decline," said Caroline Abrahams, Age UK's charity director, who signed the letter.
The Oxford report concludes that this form of marking "could be reduced without any negative effect on student progress".
Companies who sign up to the code will receive "a form of kite mark" indicating they adhere to standards of best practice.
The Lib Dem MP for East Dunbartonshire also said a form of kite-marking as a reward for organisations that take action would be welcome.
They devise a form of words to mark these new sorts of exchanges (and distinguish them from the generous reciprocal acts of friendship and gratitude).
