Notation for zero matrix
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There is no universal standard notation for zero matrices or zero vectors. You are presumably asking within the context of a paper, book, or class  you should figure out or ask about the convention used within this context.
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jmodest
Updated on September 22, 2022Comments

jmodest about 1 month
I'm confused by notation for matrices. Does $0_n$ mean a zero matrix of size nXn or a zero vector of size nX1 ?

hardmath about 5 yearsIt can be ambiguous without more context. Most authors will explain such a notation (briefly, at the beginning of the writeup or when first used). In most cases the context (which you've not referenced) can be used to resolve the author's intention if they've failed to be explicit.
