The vector stencils library "Callout blocks" contains 31 callouts, speech balloons and brackets for creating marketing infograms.
"In publishing, a call-out or callout is a short string of text connected by a line, arrow, or similar graphic to a feature of an illustration or technical drawing, and giving information about that feature. The term is also used to describe a short piece of text set in larger type than the rest of the page and intended to attract attention.
A similar device in word processing is a special text box with or without a small "tail" that can be pointed to different locations on a document." [Callout. Wikipedia]
The shapes example "Design elements - Callout blocks" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Marketing Infographics solition from the area "Business Infographics" in ConceptDraw Solution Park.