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Iron selenite, FeSe1-, exhibits intriguing and distinctive properties, which are currently in the research focus in the field of high temperature superconductors. This binary compound possesses a nematic order below 90K and becomes superconducting at about 8 K [1]. In this review report the recent results, obtained by the international research teams are presented. A structure of the vortex lattice in low magnetic field [2] and an irreversibility line are discussed, as well as microwave absorption [3] indicating two types of spin fluctuations. Anisotropy of superconducting properties [4] of these superconductors are also reported.