A hazardous substance usually says so on the packaging. There will be intructions not to ingest, there will also be a message to contact the poison control center or go to the emergency room if the product is used incorectly.
There is no single unique marking that identifies all hazardous materials. The markings in use are different for different kinds of hazardous materials.
RQ represents "reportable quantity" which means the quantity specified in column 2 of the App. to 49 CFR 172.101 for any material identified in Column 1 REF: 49 CFR 171.8
pattern of colors
User Name
website
Filename
user name
VIN Vehichle Identification Number
The doctrine that identifies God with the Universe, or the worship or tolerance of many Gods
address
This is called a domain name or a URL.
The doctrine that identifies God with the Universe, or the worship or tolerance of many Gods
user id