The phrase "a frequent hallmark" is correct and usable in written English.
It can be used to describe a characteristic or feature that occurs often in a particular context or subject.
Example: "The use of vibrant colors is a frequent hallmark of modern art."
Alternatives: "a common feature" or "a regular characteristic".
Nostalgia is a frequent hallmark of white participation in black genres, a way of signaling respect and knowledge without presuming to reshape the art form's present.
Furthermore, a frequent hallmark of tumor cells is overexpression and/or amplification of cell surface growth factor receptors (80), resulting in aberrant constitutive linker phosphorylation of Smad3 in the absence of extracellular ligand.
A frequent hallmark of genes with an extrinsic origin is the difference in GC content of these genes compared of the mean content of the host genome [ 46, 47].
Severe bone pain is a frequent presenting symptom, and is a hallmark of lytic bone lesions, which in many patients results in long bone and/or vertebral compression fractures.
He was typographic consultant at both Mergenthaler Linotype and Hallmark, the greeting cards manufacturer, and a frequent lecturer at various design colleges and universities.
The analysis identified a frequent "gain-of-function" mutation in the RAC1 gene that has all the hallmarks of UV-damage.
A frequent consequence of critical illness in the emergency department is intubation and mechanical ventilation, a hallmark of ED resuscitation and a requisite component of the clinical management of the ALI/ARDS patient.
Dr. Michaelis is a frequent guest on nationally syndicated TV shows such as, NBC's The Today Show, The Hallmark Channel's Home & Family, and MSNBC's Your Business.
Muscle stiffness is a hallmark of the disease, and "foot drop" — the term for Small's quicksand feeling — is a frequent complaint.
Representative Zoe Lofgren, a California Democrat who is a frequent critic of Justice Department priorities, said that federal agents also complained often to her about delays in wiretap requests, a hallmark of the kind of complex investigations that used to be a mainstay of federal cases.
Author is a frequent customer.
