Does anybody know what /** @type {olx.style.IconOptions} */ is and the syntax of it? What is olx mean?

var style = new ol.style.Style({
        image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
            // offset: [0, 0],
            // size: [32, 46],
            size: [28, 45],
            anchor: [0.5, 54],
            anchorXUnits: 'fraction',
            anchorYUnits: 'pixels',
            opacity: 1.0,
            src: '/images/ic-maker-default.png'
        }))
    })