It means that is is less than or equal to that number.
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> is greater than; with a line under it it is greater than or equal to < is less than; with a line under it it is less than or equal to
The less-than sign alone means "less than"; if there is a line below, it means "less than or equal".
The "more than" symbol is the > symbol. The "less than" symbol is the < symbol.
The symbol for greater than is > and the symbol for less than is <
the symbol for less than is "<" while the symbol for less than or equal to is "<" with "_" underneath it.