DIN-EN 82079-1 stipulates provisions for structuring and implementing warnings: being concise, formatting, position, and even the use of signal words are aimed at ensuring safe use of equipment. For material damage, the standard thus recommends choosing between “Note”, “Caution”, and “Attention”; whereas for personal injury, warnings should include the signal word “Risk”, “Warning”, or “Caution”. ANSI Z535.6 also stipulates use of the signal word “Note”. The choice of word not only depends on the severity of risk, but also on the likelihood of its occurrence.
Incidentally, the latter results from the risk analysis, whose content is covered in ISO 12100. This makes it easy for you to assess the severity of the risk and to decide the type of notice required for each risk.
Nowadays, warnings do not just consist of text, but also graphic elements. When it comes to color, in addition to ANSI, you can adhere to EN ISO 3864. As well as color codes, this standard also provides graphic symbols as safety symbols. If colors are not so relevant for you, ANSI Z535.6 also contains an option for black-and-white presentation. Ultimately, warnings printed in black-and-white must be able to be understood by everyone, as must warnings in color for people who may be colorblind.
EN ISO 20607 on the safety of machinery and EN ISO 7010 provide design options for warning symbols, enabling you to unify and standardize your warnings for graphics, as well as text. You are free to ultimately decide which alternatives you will adopt. However, if you abide by the key standards for warnings, you are sure to find the right solution.