Draw a custom shape

You can draw custom shapes by using shapes from the Custom Shape pop-up palette, or save a shape or path to use as a custom shape.

Select the Custom Shape tool .
Select a shape from the Custom Shape pop-up palette in the options bar.
If you don’t find a shape you want in the palette, click the arrow in the upper right corner of the palette, and choose a different category of shapes. When asked to replace current shapes, click either Replace to view only the shapes in the new category or Append to add to the shapes already displayed.
Drag in your image to draw the shape.

Photoshop