English translation: Ground row, ground-row lights
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Explanation: From reference 1:
è una piccola costruzione scenografica, alta dai 40 agli 80 cm, che solitamente si mette in prossimità di un fondale e serve a coprire i corpi illuminanti che illuminano il fondale dal basso.
From reference 2:
MASKING - (or MASK) Common name for a flat, drape or groundrow or set piece used to mask area of the stage from the audience.
GROUNDROW - A low silhouette or painted cut-out representing hills, mountains, distant horizons, city outlines, etc., that stands independently usually between the cyc and the upstage performing area.
Groundrow also seems to be used for the floor-mounted lights themselves