A fire suppression sprinkler, said sprinkler comprising: a body surrounding a bore, said bore defining a flow axis arranged coaxially with said bore; first and second frame arms (24, 26) mounted on opposite sides of said body and extending therefrom in a direction along said flow axis, said frame arms (24, 26) defining a plane; a nose mounted on the ends of said frame arms (24, 26), said nose being positioned coaxially with said flow axis; a deflector plate mounted on said nose and oriented transversely to said flow axis, said deflector plate having a periphery surrounding a center located on said flow axis, said deflector plate comprising: a plurality of slots of a first configuration extending from said periphery radially toward said center, at least two of said slots of said first configuration being disposed in said plane, wherein said slots of said first configuration have an arrowhead shape comprising a shaft extending from said periphery and an arrowhead terminating at a first distance from said center, wherein said arrowhead is asymmetric with respect to a line extending radially from said center; at least four slots of a second configuration extending from said periphery radially toward said center and being located about said periphery such that one of said slots of said second configuration is positioned adjacent to each side of each of said slots of said first configuration which are disposed in said plane; a plurality of slots of a third configuration extending from said periphery radially toward said center; wherein said slots of said second configuration have a greater area than said slots of said first configuration, characterised in that said slots of said second configuration have a club shape comprising a handle extending from said periphery and a club head terminating at a distance from said center, wherein a width of said club head proximate to said handle is less than a width of said club head proximate to said center. a body surrounding a bore, said bore defining a flow axis arranged coaxially with said bore; first and second frame arms (24, 26) mounted on opposite sides of said body and extending therefrom in a direction along said flow axis, said frame arms (24, 26) defining a plane; a nose mounted on the ends of said frame arms (24, 26), said nose being positioned coaxially with said flow axis; a deflector plate mounted on said nose and oriented transversely to said flow axis, said deflector plate having a periphery surrounding a center located on said flow axis, said deflector plate comprising: a plurality of slots of a first configuration extending from said periphery radially toward said center, at least two of said slots of said first configuration being disposed in said plane, wherein said slots of said first configuration have an arrowhead shape comprising a shaft extending from said periphery and an arrowhead terminating at a first distance from said center, wherein said arrowhead is asymmetric with respect to a line extending radially from said center; at least four slots of a second configuration extending from said periphery radially toward said center and being located about said periphery such that one of said slots of said second configuration is positioned adjacent to each side of each of said slots of said first configuration which are disposed in said plane; a plurality of slots of a third configuration extending from said periphery radially toward said center; wherein said slots of said second configuration have a greater area than said slots of said first configuration, characterised in that said slots of said second configuration have a club shape comprising a handle extending from said periphery and a club head terminating at a distance from said center, wherein a width of said club head proximate to said handle is less than a width of said club head proximate to said center. a plurality of slots of a first configuration extending from said periphery radially toward said center, at least two of said slots of said first configuration being disposed in said plane, wherein said slots of said first configuration have an arrowhead shape comprising a shaft extending from said periphery and an arrowhead terminating at a first distance from said center, wherein said arrowhead is asymmetric with respect to a line extending radially from said center; at least four slots of a second configuration extending from said periphery radially toward said center and being located about said periphery such that one of said slots of said second configuration is positioned adjacent to each side of each of said slots of said first configuration which are disposed in said plane; a plurality of slots of a third configuration extending from said periphery radially toward said center; wherein said slots of said second configuration have a greater area than said slots of said first configuration, characterised in that said slots of said second configuration have a club shape comprising a handle extending from said periphery and a club head terminating at a distance from said center, wherein a width of said club head proximate to said handle is less than a width of said club head proximate to said center. said slots of said second configuration have a greater area than said slots of said first configuration, characterised in that said slots of said second configuration have a club shape comprising a handle extending from said periphery and a club head terminating at a distance from said center, wherein a width of said club head proximate to said handle is less than a width of said club head proximate to said center.