The phrase "a reliable sign" is correct and usable in written English.
You can use it when referring to an indicator or signal that can be trusted to provide accurate information or evidence about something.
Example: "The consistent increase in sales is a reliable sign that our marketing strategy is working."
Alternatives: "a trustworthy indicator" or "a dependable signal."
The return of speculative enthusiasm is usually a reliable sign that the next big price move will probably be down.
"Vehement denial is a reliable sign that an insight has hit the mark," says Franzen at one point, echoing Freud.
As we get our of the car, he says that a celebrity friend once told him that there is a reliable sign that pinpoints the moment when an artist sells out.
As with Reich, his message is: watch out – as any student of history well knows, revolt is often a reliable sign of an imminent backlash from nasty forces of political reaction.
It makes them look weak and desperate; it is a reliable sign, in a government, of impending defeat.But it also wrong, I think, as a matter of historical record, notwithstanding the Sun's vindictive decision to come out for the Tories on the day of Mr Brown's big speech.
Without other evidence, it is not a reliable sign of implant rupture, but its presence should prompt the search of other signs of intracapsular rupture [3].
This criterion therefore is not universal, but we may say that its presence in an osteogenic tumor is a very reliable sign of malignancy; but its absence need not make one suspicious either of the malignancy of the tumor or of its place in the osteogenic series.
Overnight, there were reports of heavy selling of Japanese stock futures in the Singapore market — a pretty reliable sign that the selling was coming from foreign hedge funds.
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97 It should be noted that in some cases, hepatocyte marker protein expression may be not a very reliable sign of hepatogenic differentiation of MSC.
Again, due to the edema masquerading as the tumor, increased signal in these structures is a less reliable sign of tumoral involvement.
