What is a symbol?
A symbol is a concise representation of a concept: a sign, letter or image that stands for something else. The word comes via Latin symbolum from Greek sumbolon, a token of recognition. In formulas a symbol is usually a letter (F for force, E for modulus of elasticity). In building it is more often a graphic sign.
Where you meet symbols:
- On drawings. Hatching, level marks, door swings and service symbols. See symbols in construction drawings.
- On construction products. CE marking shows that the manufacturer has drawn up a declaration of performance under the European Construction Products Regulation. Certification marks show that a product or process is independently certified.
- On packaging. Hazardous products such as adhesives, sealants, solvents and some paints carry the hazard pictograms of the CLP Regulation: red diamonds with a black symbol, for example for flammable, toxic or corrosive.
- On site. Safety signs follow ISO 7010: blue circular mandatory signs (hard hat, ear protection), red prohibition signs, yellow warning triangles and green safe-condition signs.
- On old building parts. Masons’ marks and carpenters’ assembly marks on beams and rafters.
In practice
- Read the packaging. Check the hazard pictograms and statements before use and wear the protection listed.
- Check the CE marking. If in doubt, ask for the declaration of performance (DoP); it lists properties such as fire class or strength.
- Use assembly marks when dismantling. Number the parts of a timber structure before taking it apart, so everything goes back in the same place.
Common mistake: reading CE marking as a quality mark. It only means the manufacturer has declared the product’s performance, not that the product suits your use.
Related terms
- Symbols in construction drawings
- Symbolism in architecture
- Pictogram
- Mason’s mark
- Carpenter’s mark
Want to know more about building terms? Visit our knowledge base at fredsdiyplans.com.