what does underscore mean in Delphi4

I come across the following in code.

_name1
_name2
smeEGiGross:  

In general, what does _name1 underscore mean in Delphi 4?

I think it's just a common practice to begin variable names with underscores.

Rules for variable (and component) names in Delphi:

• Name can be any length but Delphi uses only first 255 characters.
• First character must be letter or underscore not a number.
• You cannot use any special characters such as a question mark (?), but you can use an underscore (_).
• No spaces area allowed in the name of a variable.
• Reserved words (such as begin, end, if, program) cannot be used as variables.
• Delphi is case insensitive – it does not matter whether capital letters are used or not. Just make sure the way variables or components are used is consistent throughout the program.