The phrase "a single penalty" is correct and usable in written English.
It can be used when referring to one specific punishment or consequence for an action or violation.
Example: "The referee issued a single penalty for the foul committed during the game."
Alternatives: "one penalty" or "a solitary penalty".
Tottenham were not given a single penalty last season.
He did not take a single penalty, or get in anything more than a few minor shoving matches.
New Zealand's outside-half, Daniel Carter, needs only three points — a single penalty kick — to replace England's Jonny Wilkinson as the all-time leading scorer in international rugby.
The referee didn't blow a single penalty yet stopped the game and sent players back to their mark what seemed at least 10 times.
They were also subject only to a single penalty, on the highest balance in their affected accounts over the previous six years, instead of one for each year.
It amended its proposal last week, suggesting instead to only seek damages for the cost of an individual licence fee and its court costs, and to charge customers a single penalty, rather than one based on their individual circumstances.
In particular, we show that successive 1D tuning of the Elastic Net restricts the search for tuning parameters sufficiently that it can yield inferior prediction to a single-penalty counterpart.
First, whereas LLARRMA selects variables within each subsample using a local (i.e., subsample-specific) penalty, SS uses a single global penalty λ applied to all K subsamples.
Tampa Bay responded with another long drive, this one not helped by a single Giants penalty.
On the other hand, about 20 United States attorneys did not file a single death penalty case since 1995.
Such an obstacle might have spooked horses but there were few spills; indeed 55 did not incur a single jumping penalty, including all five Britons.
