| Mat(ting) window mat | A border, usually made from matboard, placed around a print, photograph, etc., to serve as a spacer or separation between the picture and the frame. |
| Moulding | Wood or metal which has been refined and shaped, and which includes a rabbet for use in the framing industry as frame stock. |
| Multicolour | An inspiring collection with decorative designs, fun motifs and cheerful colours.… |
| Non-glare glass | Glass where one or both surfaces have been treated chemically or mechanically to slightly roughen the surface, causing reflected incident light to be dispersed in all directions. |
| Non-reflective glass | Glass that is treated, usually with a thin film coating, to significantly reduce reflections without significantly affecting the sharpness of a framed image or object behind the glass. |