The phrase "a single sign of" is correct and usable in written English.
It can be used to indicate the presence of one indication or evidence of something, often in a context where you are discussing signs or symptoms.
Example: "There was not a single sign of distress on her face, which reassured me."
Alternatives: "one indication of" or "a solitary sign of".
There was not a single sign of anything indicating arson.
When he took off his head there wasn't a single sign of perspiration on his face.
Other than a few motor boats, there isn't a single sign of humanity, and the sunrises and sunsets are as dramatic as they come.
Of the 45 lots in the catalogue more than a third fail to make their reserve price, and on many of them there is not a single sign of interest from anyone in the room.
Across the United Kingdom, livelihoods are going up in smoke, for once a single sign of the infection is discovered, any cloven-hooved animals on the lot -- like pigs, sheep or cattle -- must be slaughtered, and in many cases their carcasses must be burned.
Without a single sign of religious practice or spiritual doctrine, Shakespeare offers a stark and radical critique of the pagan world and, as such, the body of myth and tradition upon which much of the Western world's culture and much of his own work depends.
Yell, an international provider of telephone directory services, is undertaking a major fingerprint technology roll out as part of a single sign on solution that will allow thousands of its UK-based staff to log onto its computer network remotely.
The education technology company recently launched a feature that will allow students to use a single sign on to all of the Clever-supported software, which includes key education players such as Scholastic and CK-12.
That changed today when Zoho released a single sign on for six of their core services – Zoho Writer, Zoho Sheet, Zoho Show, Zoho Planner, Zoho Creator and Zoho Chat.
11.52pm BST Royal chicken Prince's couldn't be more innocuous, a turning off a junction of three petrol stations, a single sign on a small strip of shops, between a nail salon and a discount sportswear store.
It leverages the 300 million people who have participated in Boardscape message boards and allows them to create a single sign on and identity among all of the boards.
