The objects with the outlined contours is another kind of Line web icons. They're called contour drawings. You can also find another kind of icons: the items are without some strict outlines. They are known as gesture drawings. These kinds of drawings are being widely used by experienced designers who can repeat the outlines of the object right after seeing it.
One additional technique is adding some halftones and shades to the object. You can do it with the help of short lines and crosshatching. Their frequency and pencil pressure can be different. And this variety impart more three-dimensional look to the object. This particular trick is widely used in web design as well. It helps to make great Line web icons, logos and buttons.The lines with the dots not combining the singular elements are known as open lines. It may look really striking when being applied to line icons design. The lines can be gesture-like, parallel, contour etc. as well. The curves which are essential for creating complex line shapes are called Bezier curves in computer graphics. These curves are useful small features essential for creating the vector shapes like line icons, uncommon buttons etc.Computer technologies have the ability to reproduce the same designs or develop new shapes based on some older ones without extra efforts and time. Another benefit is that you can easily return to the previous adjustments with a help of the history panel. As a result there's no need to create Line web icons from scratch if you have made some faults.