self-heating or pyrophoric materials
One official definition for the word sign is "an object, quality, or event whose presence or occurrence indicates the probable presence or occurrence of something else."
The truck sign in driving indicates that trucks are allowed on that particular road or highway. It serves as a warning to other drivers to be cautious and aware of the presence of trucks on the road.
The plus sign in a chemical equation indicates the presence of more than one reactant or product. It separates individual chemical species on either side of the equation.
The presence of cloudiness in one's spinal fluid is a very serious problem. It indicates that a person may have a variety of illnesses, from meningitis to Multiple Sclerosis or tumors.
Advisory speed sign
True
It indicates helping and saving sign
plus sign
Plus sign
Intensified sedation is a sign that indicates the ombined use of alcohol and narcotics.
Chris Brown\'s birthday is May 5, making him a Taurus.
A safety symbol indicates the presence of information or instructions about health or safety at work by means of a signboard, a colour, an illuminated sign or acoustic signal, a hand signal or a verbal communication.'