What does the 'h' suffix mean?

In x86 assembly, what does an h suffix on 开发者_运维问答numbers represent?

For example:

sub CX, 13h

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"H" for "Hexadecimal", base 16. 0009H = 9 decimal, 000AH = 10 decimal, 000FH = 15 decimal, 0010H = 16, 0020H = 32 et cetera.