miniature sheet
one postage stamp or a small group of postage stamps still attached to the sheet on which they were printed
en-US/ˈmɪnɪˌt͡ʃʊɹ ˈʃit/
en-GB/ˈmɪnɪt͡ʃə ˈʃiːt/
one postage stamp or a small group of postage stamps still attached to the sheet on which they were printed