The phrase "an array of three" is correct and usable in written English.
It can be used when describing a collection or group consisting of three items or elements.
Example: "The experiment required an array of three different sensors to collect accurate data."
Alternatives: "a set of three" or "a group of three".
Each individual participated in two tasks: (1) recognizing a facial expression from an array of three pictures presented, and (2) matching a facial expression from one picture with a picture depicting a similar emotion from an array of three pictures.
The condenser was designed with 12 tubes in an array of three horizontals and four verticals with a 2-in.
The so-called 3MOS models use an array of three sensors and feature Crystal Engine Pro, for more efficient recording in low-light situations.
Particle emission was detected above the flame emission background and emission pulses for individual particles were recorded using an array of three filtered photomultiplier tubes.
Downstairs will be a 299-seat auditorium whose stage setting -- an array of three street scenes in forced perspective -- owes its design to Palladio's 16th-century Teatro Olimpico in Vicenza, Italy.
Here's how it works: a case that slips over the iPhone contains a nine-volt battery, a filter that fits over the iPhone's camera, and an array of three LEDs that produce light in the visible part of the spectrum.
An elastic belt, containing an array of six vibrotactors securely attached to the inside of the belt, is used for the vibrotactile biofeedback application on the subject.
Rogers designed an array of three hundred and sixty flexible electrodes, collectively smaller than a postage stamp, that melds into the brain's folds, achieving better contact and resolution.
Use an array of two condition variables, waitingToGo.
Gaussian smoothing is achieved by convoluting the conductance values with an array of seven values.
