Below is included the documentation for this field type from the ISO standard.
5.4 SFFloat and MFFloat
The SFFloat field or event specifies one single-precision floating point
number. MFFloat specifies zero or more single-precision floating point numbers.
SFFloats and MFFloats are written to the VRML file in ISO C floating
point format (see 2.[ISOC]). For example:
fooFloat [ 3.1415926, 12.5e-3, .0001 ]
is an MFFloat field, fooFloat, containing three floating point
values.
The initial value of an SFFloat eventOut is 0.0. The initial value of
an MFFloat eventOut is [ ].