Muhammad, Vertec is the acronym for a more "vertical" grip and more "technical" features to improve the shooting experience on this firearm. Thus "Vertec"

Muhammad, the Vertec has the Thin Straight Grips-FDE for easier point-ability and shorter web to finger reach to the trigger. In sort the Vertec is a more ergonomic pistol that the "Standard" Model.

Here ya go, from Beretta's web site: The Beretta 92FS Vertec Inox combines the benefits of the thinner vertical Vertec grip with some premium tactical and combat features found in other members of the 92 (M9) family. The sights are dovetail-mounted and easily replaceable by the user, the barrel is flush with the slide for a compact profile, and the Picatinny rail extending forward of the trigger guard makes this pistol ready for a variety of tactical accessories. In addition, the stainless steel finish makes the 92FS Vertec Inox particularly impervious to sweat, holster-wear, powder residues and corrosion, giving the user a virtual lifetime of trouble-free use.
Thin, Vertical Grip
The Vertec-style vertical grip of the 92FS Vertec Inox offers two very important benefits. Its vertical configuration makes it easy to point the handgun to where one would normally point the index finger of the dominant hand. This instinctive pointing is highly prized by tactical shooters and makes for consistent--and consistently-accurate--target acquisition. Also, the grips are thin in spite of being able to accommodate a double-stack, high-capacity magazine. This makes trigger-reach simple even for those with smaller hands, besides offering a more compact profile for those carrying this model concealed.