In this example if it can't find a float with the NAME key then it will use the 1.0f.
PlayerPrefs.GetFloat("NAME", 1.0f);
In this example it would return 0.0f as the default since you didn't set anything as the default.
PlayerPrefs.GetFloat("NAME");
EDIT: Here is the reference for GetFloat. I would recommend googling the command you have trouble with because most of the time you will find people with the same question or the official unity manuals:
http://docs.unity3d.com/ScriptReference/PlayerPrefs.GetFloat.html
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