The paper introduces a new jet shape called "N-subjettiness" designed to identify boosted hadronically-decaying objects such as electroweak bosons and top quarks. N-subjettiness is an effective discriminating variable when combined with a jet invariant mass cut, achieving tagging efficiencies of 30% for boosted W bosons and top quarks with fake rates of 1%. The method leverages the multi-body kinematics in the decay pattern of boosted objects to count the number of subjets within a jet. The ratio $\tau_N / \tau_{N-1}$ is particularly effective for identifying two-prong objects like boosted W, Z, and Higgs bosons, while $\tau_3 / \tau_2$ is useful for three-prong objects like boosted top quarks. Compared to other jet substructure techniques, N-subjettiness offers several advantages, including direct measurement of energy flow properties, flexibility in adjusting signal efficiency and background rejection, and potential for theoretical studies. The paper also explores the application of N-subjettiness in reconstructing hypothetical heavy resonances decaying to pairs of boosted objects, showing significant improvements in discovery potential. Overall, N-subjettiness is a promising tool for enhancing searches for new physics in the LHC.The paper introduces a new jet shape called "N-subjettiness" designed to identify boosted hadronically-decaying objects such as electroweak bosons and top quarks. N-subjettiness is an effective discriminating variable when combined with a jet invariant mass cut, achieving tagging efficiencies of 30% for boosted W bosons and top quarks with fake rates of 1%. The method leverages the multi-body kinematics in the decay pattern of boosted objects to count the number of subjets within a jet. The ratio $\tau_N / \tau_{N-1}$ is particularly effective for identifying two-prong objects like boosted W, Z, and Higgs bosons, while $\tau_3 / \tau_2$ is useful for three-prong objects like boosted top quarks. Compared to other jet substructure techniques, N-subjettiness offers several advantages, including direct measurement of energy flow properties, flexibility in adjusting signal efficiency and background rejection, and potential for theoretical studies. The paper also explores the application of N-subjettiness in reconstructing hypothetical heavy resonances decaying to pairs of boosted objects, showing significant improvements in discovery potential. Overall, N-subjettiness is a promising tool for enhancing searches for new physics in the LHC.