Fulminating silver is a historic name which may apply to a number of silver based explosives which "fulminate" or detonate easily and violently. It has no exact chemical or dictionary definition, but may refer to:
silver fulminate (which, confusingly, is the only "fulminating silver" to be a silver compound with the fulminate anion)
silver azide, AgN3
a mixture, a decomposition product of Tollens' reagent
silver nitride, Ag3N - one of the earliest silver based explosives
the alchemical substance "Argentum Fulminans"
The stability of many of these compounds can vary depending on how they are stored or handled, with levels of hydration often being a major factor. Wikipedia
Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
This Hazmat is classified as "Forbidden". This means the material may not be offered for transportation or transported in the applicable mode of transport.