A hefty thirty per cent of all workplace injuries take place whilst operating machinery. Such is true mostly of industrial machinery, with woodworking and metal grinding machinery at the top end of the spectrum of the most severe injuries reported over the past ten years. Employees and workers need to be safe when operating machinery. Even though most machinery is nowadays automated, a great deal of manual handling such as feeding, assembling and stacking still takes place. For this reason, employees need to be constantly warned of the dangers involved in operating particular machinery and machine safety signs are a must for almost all industrial enterprises.