An extension or straight ladder used to access an elevated surface must extend at least 3 feet above the point of support (see diagram). Do not stand on the three top rungs of a straight, single or extension ladder.
GHS pictograms - Transport - UNECE
GHS CLP pictogram rolling pin
GHS pictograms - UNECE
Know at-a-glance the hazards identified by the GHS pictograms, with this handy bookmark from CCOHS. Only $1.25
Bilingual Right to Know SDS Center Wire Rack and 3" Binder with GHS Pictograms: Amazon.com: Industrial & Scientific
GHS - Hazard Communication OSHA
Globally Harmonized System of Classification and Labelling of Chemicals