The phrase "a reminder in a" is correct and usable in written English.
It can be used when introducing a reminder that is contained within a specific context or format.
Example: "This is a reminder in a series of emails to complete your project by the deadline."
Alternatives: "a note in a" or "a prompt in a".
Keating said the listings were a reminder in a digital age of "the vital importance of libraries as physical spaces of the highest quality at the heart of their commitments".
Just as a reminder, in a September 1998 Forbes magazine story, "The Un-PC," Larry Ellison remarked: "The PC became the NC.
Among Tibetans the birthday also has occasioned trepidation: It is a reminder, in a society that believes in a succession of lives, of the tyranny of mortality when it comes to their spiritual leader.
They even have an IPhone app that sends a reminder in a child's voice every two hours to take that break from whatever is happening in their lives at that moment and utilize simple breathing techniques to relax.
Creating a reminder in a list is as easy as tapping a blank line and typing in the list's name, date, time, and other relevant information.
When a woman in a headscarf burst into tears a few feet away, gin rummy seemed a little insensitive — and perhaps it was a reminder, in an increasingly surreal atmosphere, that a courthouse is hardly a place for frivolity.
The unnatural quiet – nothing else stirs, not even a cat – is a reminder: in politics, life can change in an instant.
They are kept as a reminder: in December 2004, a suicide bomber detonated his car there, in one of a series of deadly attacks by Islamist insurgents that shook this kingdom.
Jamie McKendrick's remarkable Selected Poems (Faber) is a reminder, in this time of Brexit, of a cosmopolitan restiveness, a sophistication, that's also very English.
Officials had found a reminder in her phone detailing relationship "rules" an ex had required her to abide to.
