In this paper we discuss a peculiar low-temperature magnetic relaxation measured in a c-axis oriented bulk Bi 2 Sr 2 Ca 2 Cu 3 O 1 0 compound sample in magnetic field H = 1 T applied along the c-axis. It is shown that at temperatures T < T g 20 K, M(t) relaxation curves are best described by the equation M - M e q - M g = At - β i.e. the irreversible magnetization M i r r = M - M e q consists of a relaxing magnetization M r e l = At - β and a 'non-relaxing' ('glass') magnetization M g , while for T > T g , M g is absent. The transition to the 'glassy@'' state cannot be understood as a vortex-liquid-vortex-glass transition. It is suggested that the existence of M g is associated with a pinning-induced misalignment between 'pancake' vortices in different superconducting layers.