I am new to SQL and Stored Procedures so I am not sure this is where I should ask this question.
Anyway, in my current project other developers are added many SP into the database. To study how to write SP, I go through some of them. And in one of them I saw a line like below

-- several lines of codes
AND pohpoid <> 0
-- several lines of codes

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Sp what is this <> code really mean in SQL Stored Procedure?

Note : My wild guess is less than or greater than.