Mathematical Sciences Classification System
05Bxx - Designs and configurations 
{For applications of design theory, see  94C30}
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                            05B05
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                            05B07Triple systems
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                            05B10Difference sets (number-theoretic, group-theoretic, etc.) [See also 11B13]
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                            05B15Orthogonal arrays, Latin squares, Room squares
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                            05B20Matrices (incidence, Hadamard, etc.)
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                            05B25
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                            05B30Other designs, configurations [See also 51E30]
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                            05B35
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                            05B40
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                            05B45
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                            05B50Polyominoes
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                            05B99None of the above, but in this section