Orthogonal Transformation about [110] axis

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I am pretty stuck on this problem listed below and don't understand what [110] means here. If anyone could help I would really appreciate it.

Suppose p is a vector in R^3 and you want to rotate p about the axis [110] by an angle theta. Find the matrix R such that q = Rp.

Again mostly trying to understand what the question is really asking here instead of a direct solution.