The vector stencils library "Education callouts" contains 24 shapes of callouts, speech balloons, arrows, braces and brackets.
Use it to design your education infograms.
"Speech balloons (also speech bubbles, dialogue balloons or word balloons) are a graphic convention used most commonly in comic books, comic strips and cartoons to allow words (and much less often, pictures) to be understood as representing the speech or thoughts of a given character in the comic. There is often a formal distinction between the balloon that indicates thoughts and the one that indicates words spoken aloud: the balloon that conveys subjective thoughts is often referred to as a thought bubble." [Speech balloon. Wikipedia]
The shapes example "Design elements - Education callouts" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Education Infographics solition from the area "Business Infographics" in ConceptDraw Solution Park.