Hi Quoc,
I probably stands for something like that. (1)
1/ Please correct (1)
2/ What is the meaning of stand for here?
'stand for' means 'represent'. eg
'FBI' stands for 'Federal Bureau of Investigation'.
In the election, this candidate stands for lower taxes.
There are also some other less directly related meanings that you will find in your dictionary.
I probably stands for something like that. Without a context, it's impossible to understand this vague statement. Perhaps it refers to something like 'I' stands for Igloo in a child's reading book? Although for children, we often say more simply I is for igloo.
Best wishes, Clive