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(g77-295.info)Syntactic Items

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Syntactic Items
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   (Corresponds to Section 2.2 of ANSI X3.9-1978 FORTRAN 77.)

   In GNU Fortran, a symbolic name is at least one character long, and
has no arbitrary upper limit on length.  However, names of entities
requiring external linkage (such as external functions, external
subroutines, and `COMMON' areas) might be restricted to some arbitrary
length by the system.  Such a restriction is no more constrained than
that of one through six characters.

   Underscores (`_') are accepted in symbol names after the first
character (which must be a letter).